Sprint 232 Plan: Semantic Annotation Bridge For Planning

Goal

Make semantic annotations first-class in spec-to-taskitem planning by bridging markdown specs into typed semantic planning packets.

Step 2199: Add markdown_to_semantic_annotations bridge tool.
Step 2200: Emit semantic annotation packet types aligned with existing semantic annotation vocabulary (intent, complexity, risk, contract, tags, capability_requirement).
Step 2201: Integrate bridge output into sprint taskitem pipeline summary artifacts.
Step 2202: Add env control to enable/disable semantic planning bridge in pipeline.
Step 2203: Produce baseline packet artifacts and update tracker.
Step 2204: Add Sprint232IntegrationSummary.h.