feat(selector): 增加离线候选遍历与严格回放验证 Demo

- 新增 selector_candidate_demo，移除 provenance intent 后枚举候选 selector
- 对候选分支执行有界重建与严格 STEP 比较
- 仅在候选遍历完整且唯一 strict 通过时生成 selector 映射记录
- 增加 selector 候选搜索、预算限制和记录生成的测试
- 保持生产 selector resolver 不受 Demo 逻辑影响
- 更新 CADFS 能力台账，记录 IMPRINT 派生 profile 的 lineage selector 缺口

cadfs_to_cdsl/featurescript_parser.py

@@ -6,6 +6,27 @@ from .featurescript_lexer import Token, lex
 from .ir import Call, FeatureIR, ModelIR, SketchIR
 
 
+_IMPORT_RE = re.compile(r"\bimport\s*\(\s*(?P<arguments>.*?)\s*\)\s*;", re.DOTALL)
+_IMPORT_PATH_RE = re.compile(r"\bpath\s*:\s*['\"]([^'\"]+)['\"]")
+_IMPORT_VERSION_RE = re.compile(r"\bversion\s*:\s*['\"]([^'\"]+)['\"]")
+
+
+def _standard_library_imports(source: str) -> list[dict[str, str]]:
+    """Preserve each directly imported Onshape standard-library revision."""
+    imports: list[dict[str, str]] = []
+    for match in _IMPORT_RE.finditer(source):
+        arguments = match.group("arguments")
+        path = _IMPORT_PATH_RE.search(arguments)
+        if path is None or "onshape/std/" not in path.group(1):
+            continue
+        item = {"path": path.group(1)}
+        version = _IMPORT_VERSION_RE.search(arguments)
+        if version is not None:
+            item["version"] = version.group(1)
+        imports.append(item)
+    return imports
+
+
 def _string(value: Any) -> Any:
     if isinstance(value, str) and len(value) >= 2 and value[0] in {'"', "'"} and value[-1] == value[0]:
         try:
@@ -133,15 +154,15 @@ def _arg_map(call: Call) -> dict[str, Any]:
 def parse_featurescript(source: str, sample_id: str = "unknown") -> ModelIR:
     parser = Parser(source); calls = parser.statements()
     version = re.search(r"\bFeatureScript\s+(\d+(?:\.\d+)*)\s*;", source)
-    standard_library = re.search(
-        r"\bimport\s*\(\s*path\s*:\s*[\"']([^\"']*onshape/std/[^\"']*)[\"']",
-        source,
-    )
+    standard_library_imports = _standard_library_imports(source)
+    primary_standard_library = standard_library_imports[0] if standard_library_imports else {}
     model = ModelIR(
         sample_id,
         raw_source=source,
         featurescript_version=version.group(1) if version else None,
-        standard_library=standard_library.group(1) if standard_library else None,
+        standard_library=primary_standard_library.get("path"),
+        standard_library_version=primary_standard_library.get("version"),
+        standard_library_imports=standard_library_imports,
     )
     for call in calls:
         if call.name == "newSketch":