ties_to_requirement 这个指标忘记加到intent里面

backend/agent/skills/cad-authoring/SKILL.md

@@ -157,6 +157,7 @@ Feature level — attach `intent` to every feature:
     "label": "shaft_passage",
     "summary": "Ø45 central through bore, concentric with the outer contour",
     "why": "The fitting face of the sleeve; diameter follows the mating shaft",
+    "ties_to_requirement": "R2",
     "provenance": "authored"
   }
 }
@@ -178,6 +179,10 @@ Feature level — attach `intent` to every feature:
   Use parameterized wording (`M8`, `Ø75`, `R8`), never a restatement of the
   request prose.
 - `why` (optional, ≤400 characters): the functional reason this feature exists.
+- `ties_to_requirement` (optional): the requirement id from the task's
+  requirements contract that this feature implements. Include it whenever the
+  task carries requirement ids and the feature plainly implements one of them;
+  omit it when the task has no requirement ids. Never invent an id.
 - `provenance`: always `"authored"` when the model writes it.
 - Do not invent fields inside `intent`, and never treat a mismatch between an
   annotation and geometry as acceptable — the label must match the feature