Add story 44: Agent Completion Report via MCP

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.story_kit/stories/upcoming/44_agent_completion_report_via_mcp.md

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+---
+name: Agent Completion Report via MCP
+test_plan: pending
+---
+
+# Story 44: Agent Completion Report via MCP
+
+## User Story
+
+As an agent finishing work on a story, I want to report my completion status via an MCP tool, so that the system can deterministically advance the workflow without relying on prompt compliance.
+
+## Acceptance Criteria
+
+- [ ] MCP tool report_completion(story_id, agent_name, summary) allows agents to signal they are done
+- [ ] Server rejects the report if the agent's worktree has uncommitted changes
+- [ ] Server runs acceptance gates (clippy, tests) automatically on report
+- [ ] Completion status and results are stored on the agent record for retrieval by wait_for_agent or the supervisor
+- [ ] Agent prompts are updated to call report_completion as their final action
+
+## Out of Scope
+
+- TBD