diff --git a/src/linkerhand_calibration/O30_RAW_PROTOCOL_IMPLEMENTATION.md b/src/linkerhand_calibration/O30_RAW_PROTOCOL_IMPLEMENTATION.md
index be73e6c..09ff7d2 100644
--- a/src/linkerhand_calibration/O30_RAW_PROTOCOL_IMPLEMENTATION.md
+++ b/src/linkerhand_calibration/O30_RAW_PROTOCOL_IMPLEMENTATION.md
@@ -34,6 +34,11 @@ ros2 run linkerhand_calibration calibrate_hand \
 
 后续恢复省略 `--no-resume`，仍需提供当前安装条件下的光学观测。若安装参考不可核验，按拒绝原因处理，不能改哈希绕过。
 
+2026-09-22 用户明确要求复用已完成的相机标定：可将上述光学观测参数换为
+`--reuse-camera-calibration`。此入口仍核对已有相机标定质量、受保护文件和实时
+CameraInfo；日志及发布审计记录 `current_optical_verification: not_performed`，
+不宣称本次重新做过光学核验。第三轮独立关节精度、候选不确定度与 URDF 发布检查不变。
+
 现有 `three_camera_extrinsics.launch.py` 增加 `verification_extrinsics_file`：指定受保护外参文件、另设 JSON `output_file`，沿用棋盘格采集及保存操作。该模式不重拟合相机参数，保存同步多姿态角点，并验证冻结内外参；每个机位至少 15 组，跨机位同步不超过 50 ms，同时检查图像/倾角覆盖及原重投影门限。正常外参标定模式不变。核验模式的角点 JSON 用于上述启动参数。
 
 关键文件：
diff --git a/src/linkerhand_calibration/TESTING.md b/src/linkerhand_calibration/TESTING.md
index 95ad9e0..a1fafdd 100644
--- a/src/linkerhand_calibration/TESTING.md
+++ b/src/linkerhand_calibration/TESTING.md
@@ -554,6 +554,13 @@ Schur 协方差与完整逆矩阵一致、冻结模型拒绝无法解释的阶
 
 ## O30 raw_joint 正式链路（2026-09-22）
 
+用户指定停滞重试（2026-09-22）：仅 O30 的 `mechanical_stall` 增加同一运动
+首次尝试加两次重试，每次重发前等待 3 秒，第 3 次失败停止。等待不发送新位置
+指令，不作为有效采样；失联、控制权冲突及其他保护仍检查。真实 coordinator
+虚拟时钟验证三次失败、两次等待和等待期间保护：3 passed，1.00 秒。
+既有安全及反馈组 44 passed；另一条旧启动测试补充显式复用相机参数后通过。
+测试夹具曾缺少 SDK 心跳，已补齐模拟心跳，未因此改变生产通信保护。
+
 新默认协议及完整边界见 `O30_RAW_PROTOCOL_IMPLEMENTATION.md`。
 
 针对性验证（不同组有重叠，不相加宣称一次全量回归）：
diff --git a/src/linkerhand_calibration/launch/three_camera_calibration.launch.py b/src/linkerhand_calibration/launch/three_camera_calibration.launch.py
index 8dd6f66..18aa155 100644
--- a/src/linkerhand_calibration/launch/three_camera_calibration.launch.py
+++ b/src/linkerhand_calibration/launch/three_camera_calibration.launch.py
@@ -306,6 +306,7 @@ def _launch_stack(context):
                 "capture_plan_expected_sha256": ParameterValue(
                     LaunchConfiguration("capture_plan_expected_sha256"), value_type=str),
                 "initial_command_file": LaunchConfiguration("initial_command_file"),
+                "reuse_camera_calibration": ParameterValue(LaunchConfiguration("reuse_camera_calibration"), value_type=bool),
                 "camera_optical_observations_file": LaunchConfiguration("camera_optical_observations_file"),
                 "command_topic": command_topic,
                 "state_topic": state_topic,
@@ -469,6 +470,7 @@ def generate_launch_description() -> LaunchDescription:
             DeclareLaunchArgument("preparation_witnesses_json", default_value=""),
             DeclareLaunchArgument("capture_plan_expected_sha256", default_value=""),
             DeclareLaunchArgument("initial_command_file", default_value=""),
+            DeclareLaunchArgument("reuse_camera_calibration", default_value="false"),
             DeclareLaunchArgument("camera_optical_observations_file", default_value=""),
             DeclareLaunchArgument(
                 "calibration_config",
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_finalization.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_finalization.py
index 0f2bd10..9c2059b 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_finalization.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_finalization.py
@@ -82,10 +82,18 @@ def finalize_raw_joint_session(*, profile, session_dir, serial_number, source_ur
             quality_limits=profile.vision.extrinsics_quality_limits,
             minimum_capture_counts=profile.vision.minimum_capture_counts)
         checks = [r for r in records if r.get('kind') == 'measured_optical_verification']
-        if not checks:
+        reuse = [r for r in records if r.get('kind') == 'existing_camera_calibration_reused']
+        if checks:
+            optical = verify_optical_observations(checks[-1]['observations'], extrinsics, matrices,
+                extrinsics_sha256=protected_inputs['camera_extrinsics_sha256'])
+        elif len(reuse) == 1:
+            from ..optical_verification import accept_existing_camera_calibration
+            optical = accept_existing_camera_calibration(profile, extrinsics_path,
+                protected_inputs['camera_extrinsics_sha256'])
+            if reuse[0]['acceptance'] != optical:
+                raise ValueError('raw_joint_camera_reuse_evidence_changed')
+        else:
             raise ValueError('raw_joint_measured_optical_verification_missing')
-        optical = verify_optical_observations(checks[-1]['observations'], extrinsics, matrices,
-            extrinsics_sha256=protected_inputs['camera_extrinsics_sha256'])
         model = UrdfKinematicModel(source)
         bundle = UrdfCommandImages(profile, model, extrinsics, training, compile_tag_links(profile, model))
         audit = []
@@ -125,7 +133,9 @@ def finalize_raw_joint_session(*, profile, session_dir, serial_number, source_ur
             serial_number=serial_number, protected_inputs=protected_inputs)
         from ...core.domain.capture_plan import evidence_digest
         report['raw_joint_audit'].update(installation_reference_sha256=evidence_digest(reference),
-            optical_observations_sha256=optical['observations_sha256'])
+            camera_acceptance=optical)
+        if 'observations_sha256' in optical:
+            report['raw_joint_audit']['optical_observations_sha256'] = optical['observations_sha256']
         naming = dict(serial_number=serial_number, side=profile.key.side, model=profile.key.model.lower())
         json_path = directory/profile.artifacts.calibration_filename.format(**naming)
         urdf_path = directory/profile.artifacts.corrected_urdf_filename.format(**naming)
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_validator.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_validator.py
index b5da23a..66e17df 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_validator.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/artifacts/raw_joint_validator.py
@@ -28,7 +28,11 @@ class RawJointArtifactValidator:
         report = json.loads((json_path.parent / REPORT_FILENAME).read_text(encoding='utf-8'))
         if evidence_digest(report) != evidence_digest(self.report) or payload != from_report(self.report):
             raise ValueError('raw_joint_serialized_report_changed')
-        if not self.validation['passed'] or not self.optical['passed']:
+        camera_accepted = self.optical.get('passed') is True or (
+            self.optical.get('policy') == 'reuse_validated_camera_calibration_v1'
+            and self.optical.get('accepted') is True
+            and self.optical.get('camera_extrinsics_sha256') == self.report['protected_inputs']['camera_extrinsics_sha256'])
+        if not self.validation['passed'] or not camera_accepted:
             raise ValueError('raw_joint_independent_acceptance_failed')
         bundle, profile = self.bundle, self.bundle.profile
         offsets = bundle.zero_offsets(self.candidate.parameters)
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/coordinator.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/coordinator.py
index e6616d1..dd73ba3 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/coordinator.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/coordinator.py
@@ -85,6 +85,8 @@ class CalibrationCoordinator:
             from .training import TrainingWorker
             self.training_worker = TrainingWorker()
         self.safety = SafetyPolicy(profile)
+        from .stall_retry import StallRetry
+        self.stall_retry = StallRetry() if profile.key.model.upper() == 'O30' else None
         self.reference_lock = self._new_reference_lock()
         self.trackers = parameters.new_trackers(self.required_observation_views)
         self.capture = ObservationCapture(profile, reference_lock=self.reference_lock,
@@ -512,6 +514,8 @@ class CalibrationCoordinator:
                 if row.get("kind") in {"diagnostic_observation_frame", "raw_observation_frame"}:
                     row.update(session_epoch=epoch, motion_version=motion_version,
                         motion_started_ns=self._motion_started_ns)
+                    if self.stall_retry is not None and self.stall_retry.waiting:
+                        row.update(sample_phase='stall_retry_wait', accepted_sample_window_open=False)
                     if motion.phase == "steady" and motion.minimum_hold_seconds > 0:
                         row.update(diagnostic_hold_timing(command_history, target=motion.target,
                             image_stamp_ns=stamp, session_epoch=epoch, motion_version=motion_version,
@@ -658,12 +662,38 @@ class CalibrationCoordinator:
             self.state_receive_times[-1] if self.state_receive_times else None,
             tuple(current), tuple(self.latest_feedback), fresh,
             competing_controller=self.ports.command_publisher_count() > 1,
-            motion_expected=self.segment.motion_expected if self.segment else False,
+            motion_expected=(self.segment.motion_expected if self.segment else False)
+                and not (self.stall_retry and self.stall_retry.waiting),
             motion_id=self.segment.identity if self.segment else "",
             motion_goals=self.segment.goals if self.segment else ()))
         if not decision.safe:
+            if (decision.code == 'mechanical_stall' and self.stall_retry is not None
+                    and self.segment is not None):
+                retry = self.stall_retry.failed(self.segment.identity, now)
+                append_jsonl(self.raw_path, dict(kind='motion_stall_retry',
+                    stamp_ns=self.ports.clock_ns(), motion_id=self.segment.identity,
+                    failure_count=self.stall_retry.failures, maximum_failures=3,
+                    delay_seconds=3.0 if retry else 0., retry_scheduled=retry,
+                    target=list(self.segment.command.target), reason=decision.details))
+                if retry:
+                    self._steady_capture_after_ns = None
+                    self.reason = f'motion_stall_retry_wait:{self.stall_retry.failures}/3:delay_seconds=3'
+                    return
+                self._pause(f'{decision.code}:{decision.reason}:{decision.details},consecutive_failures=3')
+                return
             self._pause(f"{decision.code}:{decision.reason}:{decision.details}")
             return
+        if self.stall_retry is not None and self.stall_retry.waiting:
+            elapsed = self.stall_retry.resume(now)
+            if elapsed is None:
+                self.reason = f'motion_stall_retry_wait:{self.stall_retry.failures}/3:remaining={self.stall_retry.remaining(now):.1f}s'
+                return
+            self.segment.suspend_elapsed(elapsed)
+            self._steady_capture_after_ns = None
+            self._steady_rows.clear()
+            append_jsonl(self.raw_path, dict(kind='motion_stall_retry_resumed',
+                stamp_ns=self.ports.clock_ns(), motion_id=self.segment.identity,
+                attempt=self.stall_retry.failures+1, waited_seconds=elapsed))
         if self.visual_motion is not None and self.segment is not None:
             reason = self.visual_motion.check(self.segment, now)
             if reason:
@@ -1543,6 +1573,17 @@ class CalibrationCoordinator:
         from .optical_verification import verify_optical_observations
         from .camera_preflight import CameraCheck
         path = self.parameters.camera_optical_observations_file
+        if path is None and self.parameters.reuse_camera_calibration:
+            from .optical_verification import accept_existing_camera_calibration
+            report = accept_existing_camera_calibration(self.profile,
+                self.parameters.camera_extrinsics_file,
+                self.parameters.protected_inputs['camera_extrinsics_sha256'])
+            append_jsonl(self.raw_path, dict(kind='existing_camera_calibration_reused',
+                stamp_ns=self.ports.clock_ns(), acceptance=report))
+            atomic_write_json(self.parameters.session_dir / 'camera_preflight.json',
+                dict(kind='camera_preflight', stage='at_start',
+                    **self._camera_preflight.as_dict(), camera_acceptance=report))
+            return
         if path is None:
             raise ValueError('missing_measured_optical_observations')
         dataset = json.loads(path.read_text(encoding='utf-8'))
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/motion_execution.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/motion_execution.py
index 8f41465..7d94551 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/motion_execution.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/motion_execution.py
@@ -132,6 +132,14 @@ class MotionExecution:
             raise ValueError("invalid measured feedback target")
         self.reference_tolerance = 2*self.stability
 
+    def suspend_elapsed(self, seconds):
+        """Exclude a retry delay from motion and settling clocks."""
+        self.started_at += seconds
+        if self.finished_at is not None:
+            self.finished_at += seconds
+        self.history.clear()
+        self.stamped_history.clear()
+
     def sample(self, now: float) -> tuple[float, ...]:
         distance = max((abs(v) for v in self.deltas), default=0.0)
         elapsed = max(0.0, float(now)-self.started_at)
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/optical_verification.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/optical_verification.py
index 20a13ab..3504bfe 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/optical_verification.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/optical_verification.py
@@ -12,6 +12,24 @@ from ..core.geometry.tag_pose.urdf_command_images import rigid
 from ..core.geometry.tag_pose.parameters import DEFAULT_POSE_TRACKING_PARAMETERS
 
 
+def accept_existing_camera_calibration(profile, path, expected_sha256):
+    """Explicit reuse of prior calibration, without claiming a fresh optical check."""
+    import hashlib
+    from pathlib import Path
+    from ..core.geometry.extrinsics import load_camera_extrinsics
+    source = Path(path)
+    if hashlib.sha256(source.read_bytes()).hexdigest() != expected_sha256:
+        raise ValueError('existing_camera_calibration_changed')
+    calibrated = load_camera_extrinsics(source, required_views=profile.vision.view_names,
+        reference_view=profile.vision.extrinsic_reference_view,
+        quality_limits=profile.vision.extrinsics_quality_limits,
+        minimum_capture_counts=profile.vision.minimum_capture_counts)
+    return dict(policy='reuse_validated_camera_calibration_v1', accepted=True,
+        passed=False, current_optical_verification='not_performed',
+        camera_extrinsics_sha256=expected_sha256, prior_quality=dict(calibrated.quality),
+        intrinsics_updated=False, extrinsics_updated=False)
+
+
 def verify_optical_observations(dataset, extrinsics, matrices, *, extrinsics_sha256):
     if (dataset.get('protocol') != 'rectified_optical_check_v1'
             or dataset.get('camera_extrinsics_sha256') != extrinsics_sha256
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/parameters.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/parameters.py
index e0808f5..5ca83cf 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/parameters.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/parameters.py
@@ -43,6 +43,7 @@ class RuntimeParameters:
     initial_command: tuple[float, ...] = ()
     initial_device_uid: str = ""
     resume_mode: str = "verify"
+    reuse_camera_calibration: bool = False
     camera_optical_observations_file: Path | None = None
 
     def new_trackers(self, views):
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/raw_resume.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/raw_resume.py
index f521ed8..9b6bc1b 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/raw_resume.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/raw_resume.py
@@ -1,5 +1,5 @@
 """Reference-bound replay of the raw protocol's finite acquisition schedule."""
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from collections import defaultdict, deque
 
 import numpy as np
@@ -76,7 +76,11 @@ class RawCheckpoint:
         checker = ResumeVerifier(required_fixed_views=profile.vision.view_names,
             required_fixed_poses=profile.vision.view_names,
             required_hashes=current['protected_hashes'])
-        decision = checker.compare(fingerprint_from_mapping(previous), fingerprint_from_mapping(current))
+        # Moving-tag installation is verified below from baseline pixels and
+        # feedback. A PnP branch is not an installation identity in this protocol.
+        decision = checker.compare(
+            replace(fingerprint_from_mapping(previous), moving_tag_poses={}),
+            replace(fingerprint_from_mapping(current), moving_tag_poses={}))
         if not decision.reuse:
             raise ValueError('raw_resume_reference_changed:' + str(decision.incompatible_fields))
         old = self.fixed_reference.get('raw_installation_reference', {})
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/reporting/reasons_zh.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/reporting/reasons_zh.py
index a5d4d85..fec47cc 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/reporting/reasons_zh.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/reporting/reasons_zh.py
@@ -170,6 +170,10 @@ def reason_zh(
     if reason.startswith("mechanical_stall:"):
         timeout = re.search(r"(?:[:,])timeout_seconds=([0-9]+(?:\.[0-9]+)?)(?:,|$)", reason)
         duration = f" {timeout.group(1)} 秒" if timeout else "两秒"
+        if 'consecutive_failures=3' in reason:
+            return ('MOTION-STALL-303',
+                f'同一运动连续 3 次失败，每次反馈{duration}未推进；两次重发前均等待 3 秒，已停止。',
+                '检查机械阻挡、执行器和实际行程；本次重试预算已用尽。')
         return (
             "MOTION-STALL-303",
             f"目标电机连续{duration}没有向目标推进，程序已保持当前位置。",
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/ros/parameters.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/ros/parameters.py
index 40e4623..6bb5964 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/ros/parameters.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/ros/parameters.py
@@ -33,6 +33,7 @@ def parameter_defaults(profile) -> dict[str, Any]:
         "preparation_witnesses_json": "",
         "capture_plan_expected_sha256": "",
         "initial_command_file": "",
+        "reuse_camera_calibration": False,
         "camera_optical_observations_file": "",
         "command_topic": f"/{model}/cb_right_hand_control_cmd",
         "state_topic": f"/{model}/cb_right_hand_state",
@@ -175,6 +176,7 @@ def load_runtime_parameters(profile, value: Callable[[str], Any]) -> RuntimePara
         diagnostic_capture=diagnostic_capture,
         initial_command=initial_command, initial_device_uid=device_uid,
         resume_mode=resume_mode,
+        reuse_camera_calibration=bool(value("reuse_camera_calibration")),
         camera_optical_observations_file=(Path(str(value("camera_optical_observations_file"))).expanduser().resolve()
             if value("camera_optical_observations_file") else None),
     )
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/runner.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/runner.py
index 3e52cb7..2618553 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/runner.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/runner.py
@@ -117,6 +117,7 @@ def run_online(
     config: ProductConfig, *, record_bag: bool = False,
     commands_enabled: bool = True, allow_resume: bool = True,
     diagnostic_capture: str = "", startup_timeout: float = 120.0,
+    reuse_camera_calibration: bool = False,
     camera_optical_observations_file: Path | None = None,
 ) -> int:
     import rclpy
@@ -231,6 +232,8 @@ def run_online(
                 else:
                     print(f"{diagnostic_capture_label(diagnostic.mode)}：仅执行声明任务各一次往返，保留准备和零位采集；不复用断点、不拟合或发布标定产物。", flush=True)
             launch_options = {"diagnostic_capture": diagnostic_capture} if diagnostic is not None else {}
+            if reuse_camera_calibration:
+                launch_options["reuse_camera_calibration"] = True
             if camera_optical_observations_file is not None:
                 launch_options["camera_optical_observations_file"] = camera_optical_observations_file
             if commands_enabled and profile.vision_motion:
@@ -346,6 +349,8 @@ def main(args: list[str] | None = None) -> None:
     diagnostic_options.add_argument("--diagnostic-capture", choices=sorted(DIAGNOSTIC_CAPTURE_PRESETS),
                         default="", help="执行已声明的诊断任务，只保存诊断数据，不发布标定产物")
     parser.add_argument("--offline-raw", default="")
+    parser.add_argument("--reuse-camera-calibration", action="store_true",
+        help="明确复用已验收相机标定，不执行新的棋盘格核验；记录本次未复核光学状态")
     parser.add_argument("--camera-optical-observations", type=Path,
         help="当前安装下的多姿态同步标定板角点 JSON；新 O30 协议启动前重新计算光学核验")
     parser.add_argument("--offline-output", default="")
@@ -422,6 +427,8 @@ def main(args: list[str] | None = None) -> None:
     if selected.offline_output or selected.publish_offline:
         parser.error("--offline-output/--publish-offline require --offline-raw")
     online_options = {"diagnostic_capture": diagnostic_capture} if diagnostic is not None else {}
+    if selected.reuse_camera_calibration:
+        online_options["reuse_camera_calibration"] = True
     if selected.camera_optical_observations is not None:
         online_options["camera_optical_observations_file"] = selected.camera_optical_observations
     if selected.startup_timeout_seconds is not None:
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/runner_support.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/runner_support.py
index d8f983d..587b89e 100644
--- a/src/linkerhand_calibration/linkerhand_calibration/runtime/runner_support.py
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/runner_support.py
@@ -98,10 +98,12 @@ def launch_command(
     resume_from: Path | None = None,
     diagnostic_capture: str = "",
     initial_command_file: Path | None = None,
+    reuse_camera_calibration: bool = False,
     camera_optical_observations_file: Path | None = None,
 ) -> list[str]:
     """Build the single launch invocation entirely from the product contract."""
     arguments = {
+        "reuse_camera_calibration": str(reuse_camera_calibration).lower(),
         "camera_optical_observations_file": str(camera_optical_observations_file or ""),
         "model": config.model,
         "hand_type": config.side,
diff --git a/src/linkerhand_calibration/linkerhand_calibration/runtime/stall_retry.py b/src/linkerhand_calibration/linkerhand_calibration/runtime/stall_retry.py
new file mode 100644
index 0000000..dca9291
--- /dev/null
+++ b/src/linkerhand_calibration/linkerhand_calibration/runtime/stall_retry.py
@@ -0,0 +1,32 @@
+"""Bounded, clock-driven retries of the same motion after a progress timeout."""
+from dataclasses import dataclass
+
+
+@dataclass
+class StallRetry:
+    maximum_failures: int = 3
+    delay_seconds: float = 3.0
+    motion_id: str = ''
+    failures: int = 0
+    waiting_since: float | None = None
+
+    @property
+    def waiting(self):
+        return self.waiting_since is not None
+
+    def failed(self, motion_id, now):
+        if self.motion_id != motion_id:
+            self.motion_id, self.failures = motion_id, 0
+        self.failures += 1
+        self.waiting_since = now if self.failures < self.maximum_failures else None
+        return self.waiting
+
+    def remaining(self, now):
+        return max(0., self.delay_seconds-(now-self.waiting_since)) if self.waiting else 0.
+
+    def resume(self, now):
+        if not self.waiting or self.remaining(now) > 0:
+            return None
+        elapsed = now-self.waiting_since
+        self.waiting_since = None
+        return elapsed
diff --git a/src/linkerhand_calibration/test/test_native_position_feedback.py b/src/linkerhand_calibration/test/test_native_position_feedback.py
index 1b1638d..6690c79 100644
--- a/src/linkerhand_calibration/test/test_native_position_feedback.py
+++ b/src/linkerhand_calibration/test/test_native_position_feedback.py
@@ -192,6 +192,7 @@ def test_ten_unit_tracking_offset_allows_motion_and_stable_capture(phase):
 def test_production_o30_requires_fresh_feedback_before_start_and_during_motion(tmp_path):
     from runtime_host_fixture import coordinator_fixture
     host, clock = coordinator_fixture(tmp_path, model="o30")
+    host.parameters = replace(host.parameters, reuse_camera_calibration=True)
     try:
         for view in host.profile.vision.view_names:
             host.cameras.matrices[view] = np.eye(3)
diff --git a/src/linkerhand_calibration/test/test_optical_verification.py b/src/linkerhand_calibration/test/test_optical_verification.py
index 575f167..081332d 100644
--- a/src/linkerhand_calibration/test/test_optical_verification.py
+++ b/src/linkerhand_calibration/test/test_optical_verification.py
@@ -44,3 +44,26 @@ def test_configuration_identity_cannot_replace_optical_observations(optical, err
         dataset['captures'][0]['views']['b']['image_stamp_ns'] += 60_000_000
     with pytest.raises(ValueError, match='optical_'):
         verify_optical_observations(dataset, extrinsics, matrices, extrinsics_sha256='a'*64)
+
+
+def test_explicit_camera_reuse_checks_prior_quality_without_claiming_new_measurement(tmp_path):
+    import hashlib
+    from pathlib import Path
+    import yaml
+    from linkerhand_calibration.profiles import load_bundled_hand_profile
+    from linkerhand_calibration.runtime.optical_verification import accept_existing_camera_calibration
+    profile = load_bundled_hand_profile('o30_right_18')
+    source = Path(__file__).resolve().parents[3]/'config/o30_three_camera_extrinsics_20260922_101452.yaml'
+    path = tmp_path/'cameras.yaml'
+    path.write_bytes(source.read_bytes())
+    digest = hashlib.sha256(path.read_bytes()).hexdigest()
+    report = accept_existing_camera_calibration(profile, path, digest)
+    assert report['accepted'] is True and report['passed'] is False
+    assert report['current_optical_verification'] == 'not_performed'
+    with pytest.raises(ValueError, match='existing_camera_calibration_changed'):
+        accept_existing_camera_calibration(profile, path, '0'*64)
+    payload = yaml.safe_load(path.read_text())
+    payload['quality']['reprojection_rms_px'] = 100.
+    path.write_text(yaml.safe_dump(payload))
+    with pytest.raises(ValueError):
+        accept_existing_camera_calibration(profile, path, hashlib.sha256(path.read_bytes()).hexdigest())
diff --git a/src/linkerhand_calibration/test/test_raw_resume.py b/src/linkerhand_calibration/test/test_raw_resume.py
index c3c8b39..ad5c41d 100644
--- a/src/linkerhand_calibration/test/test_raw_resume.py
+++ b/src/linkerhand_calibration/test/test_raw_resume.py
@@ -66,6 +66,30 @@ def test_reordered_checkpoint_cannot_skip_work():
         checkpoint.restore(session)
 
 
+def test_reference_uses_raw_installation_pixels_not_moving_pnp_branch():
+    from copy import deepcopy
+    from linkerhand_calibration.runtime.engine import ACQUISITION_POLICY_VERSION
+    selected = profile()
+    corners = [[0., 0.], [10., 0.], [10., 10.], [0., 10.]]
+    pose = dict(rotation_xyzw=[0., 0., 0., 1.], translation_xyz_m=[0., 0., 1.])
+    reference = dict(profile_id=selected.key.profile_id,
+        acquisition_policy_version=ACQUISITION_POLICY_VERSION,
+        protected_hashes={'source_urdf_sha256': 'a'*64},
+        fixed_corners_by_view={v: corners for v in selected.vision.view_names},
+        fixed_poses={v: pose for v in selected.vision.view_names},
+        moving_tag_poses={'front:thumb_mcp': pose},
+        raw_installation_reference={'front:thumb_mcp': dict(corners_xy=deepcopy(corners),
+            feedback=list(selected.command.baseline_values))})
+    current = deepcopy(reference)
+    current['moving_tag_poses'] = {}
+    checkpoint = RawCheckpoint({}, reference, (dict(kind='raw_observation_frame',
+        view='front', tags={'thumb_mcp': {}}),), frozenset())
+    checkpoint.verify_reference(selected, current)
+    current['raw_installation_reference']['front:thumb_mcp']['corners_xy'][0][0] += 20.
+    with pytest.raises(ValueError, match='raw_resume_installation_changed'):
+        checkpoint.verify_reference(selected, current)
+
+
 def test_discovery_preserves_interrupted_first_attempt_without_any_passed_unit(tmp_path):
     import json
     from linkerhand_calibration.core.domain.capture_plan import CapturePlan
diff --git a/src/linkerhand_calibration/test/test_stall_retry.py b/src/linkerhand_calibration/test/test_stall_retry.py
new file mode 100644
index 0000000..265969c
--- /dev/null
+++ b/src/linkerhand_calibration/test/test_stall_retry.py
@@ -0,0 +1,87 @@
+"""Exercise actual coordinator command delivery with a stationary motor."""
+import json
+from dataclasses import replace
+
+import pytest
+
+from runtime_host_fixture import coordinator_fixture, ready
+from linkerhand_calibration.runtime.motion_execution import MotionCommand, MotionExecution
+from linkerhand_calibration.runtime.session import CalibrationPhase as Phase
+
+
+def blocked_host(tmp_path, monkeypatch):
+    host, clock = coordinator_fixture(tmp_path, model='o30')
+    ready(host, clock)
+    host.parameters = replace(host.parameters, reuse_camera_calibration=True)
+    assert host.start().success
+    host.execution.session.phase = Phase.SWEEP
+    start = host.profile.command.baseline_values
+    target = list(start); target[0] = 255.
+    task = host.profile.motion.tasks[0]
+    motion = MotionCommand('sweep', tuple(target), 200., task_key=task.key,
+        command_index=0, cycle=0, direction='increasing')
+    host._motion = motion
+    host.last_command = start
+    host.segment = MotionExecution(host.profile, motion, initial_command=start,
+        initial_feedback=start, now=clock.now, identity='test_stalled_segment')
+    monkeypatch.setattr(host.execution, 'motion', lambda current: motion)
+    return host, clock, start
+
+
+def heartbeat(host, clock):
+    clock.health_receiver(json.dumps(dict(hand_type='right', model='O30', side='RIGHT',
+        uid='OFFLINE_DEVICE', joint_names=list(host.profile.command.names),
+        online=True, position_mode=True, active_faults=[], joint_faults={})))
+
+
+def advance(host, clock, feedback, seconds=.1):
+    clock.now += seconds
+    heartbeat(host, clock)
+    host.receive_feedback(host.profile.command.names, feedback, host.ports.clock_ns())
+    host.tick()
+
+
+def test_two_delayed_resends_then_third_failure_stops(tmp_path, monkeypatch):
+    host, clock, feedback = blocked_host(tmp_path, monkeypatch)
+    try:
+        for _ in range(500):
+            if host.state == 'PAUSED':
+                break
+            waiting = host.stall_retry.waiting and host.stall_retry.remaining(clock.now) > .11
+            sent = len(clock.positions)
+            advance(host, clock, feedback)
+            if waiting:
+                assert len(clock.positions) == sent
+        assert host.state == 'PAUSED'
+        assert 'consecutive_failures=3' in host.reason
+        rows = [json.loads(line) for line in host.raw_path.read_text().splitlines()]
+        failures = [r for r in rows if r.get('kind') == 'motion_stall_retry']
+        resumes = [r for r in rows if r.get('kind') == 'motion_stall_retry_resumed']
+        assert [r['failure_count'] for r in failures] == [1, 2, 3]
+        assert [r['attempt'] for r in resumes] == [2, 3]
+        assert all(3. <= r['waited_seconds'] < 3.11 for r in resumes)
+        assert all(a['stamp_ns'] < b['stamp_ns'] for a,b in zip(failures,resumes))
+    finally:
+        host.close()
+
+
+@pytest.mark.parametrize('fault', ['feedback_stale', 'duplicate_controller'])
+def test_other_protection_still_stops_during_retry_delay(tmp_path, monkeypatch, fault):
+    host, clock, feedback = blocked_host(tmp_path, monkeypatch)
+    try:
+        for _ in range(200):
+            advance(host, clock, feedback)
+            if host.stall_retry.waiting:
+                break
+        assert host.stall_retry.waiting
+        if fault == 'feedback_stale':
+            clock.now += host.profile.acquisition.feedback_stale_seconds+.1
+        else:
+            clock.publishers = 2
+        heartbeat(host, clock)
+        host.tick()
+        assert host.state == 'PAUSED'
+        assert fault in host.reason
+        assert host.stall_retry.failures == 1
+    finally:
+        host.close()