refactor: simplify distillation data layout

designir-pipeline/skills/cad-experience-builder/scripts/cad_experience.py

@@ -618,17 +618,15 @@ def plugin_root() -> Path:
 
 
 def default_library_path() -> Path:
-    return (
-        plugin_root()
-        / "workspace"
-        / "promotion"
-        / "promoted"
-        / "library.json"
-    )
+    return plugin_root() / "output" / "library.json"
 
 
-def parser_root() -> Path:
-    return plugin_root() / "workspace" / "teacher"
+def input_root() -> Path:
+    return plugin_root() / "input"
+
+
+def runs_root() -> Path:
+    return plugin_root() / "runs"
 
 
 def step_files(root: Path) -> list[Path]:
@@ -684,7 +682,7 @@ def extract_folder(input_dir: Path, output_dir: Path) -> dict[str, Any]:
 
 
 def default_review_dir() -> Path:
-    return plugin_root() / "workspace" / "promotion" / "candidates"
+    return runs_root() / "review"
 
 
 def prepare_semantic_batch(
@@ -1088,15 +1086,15 @@ def build_parser() -> argparse.ArgumentParser:
 
     extract_folder_parser = subparsers.add_parser("extract-folder")
     extract_folder_parser.add_argument(
-        "--input", type=Path, default=parser_root() / "inbox"
+        "--input", type=Path, default=input_root()
     )
     extract_folder_parser.add_argument(
-        "--output", type=Path, default=parser_root() / "evidence"
+        "--output", type=Path, default=runs_root() / "evidence"
     )
 
     prepare_parser = subparsers.add_parser("prepare")
     prepare_parser.add_argument(
-        "--input", type=Path, default=parser_root() / "evidence"
+        "--input", type=Path, default=runs_root() / "evidence"
     )
     prepare_parser.add_argument(
         "--library", type=Path, default=default_library_path()
@@ -1110,7 +1108,7 @@ def build_parser() -> argparse.ArgumentParser:
     publish_parser = subparsers.add_parser("publish")
     publish_parser.add_argument("--draft", type=Path, required=True)
     publish_parser.add_argument(
-        "--input", type=Path, default=parser_root() / "evidence"
+        "--input", type=Path, default=runs_root() / "evidence"
     )
     publish_parser.add_argument(
         "--library", type=Path, default=default_library_path()
@@ -1125,7 +1123,7 @@ def build_parser() -> argparse.ArgumentParser:
         help="LLM-authored proposal draft. Without this, publishing is blocked.",
     )
     distill_parser.add_argument(
-        "--input", type=Path, default=parser_root() / "evidence"
+        "--input", type=Path, default=runs_root() / "evidence"
     )
     distill_parser.add_argument(
         "--library", type=Path, default=default_library_path()