story-kit: create 221_story_replace_llm_driven_qa_stage_with_deterministic_rust_pipeline

.story_kit/work/1_upcoming/221_story_replace_llm_driven_qa_stage_with_deterministic_rust_pipeline.md

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+---
+name: "Replace LLM-driven QA stage with deterministic Rust pipeline"
+---
+
+# Story 221: Replace LLM-driven QA stage with deterministic Rust pipeline
+
+## User Story
+
+As a Story Kit user, I want the QA stage to run deterministic quality checks in Rust (script/test, coverage comparison) instead of spawning an LLM agent, so that QA is fast, free, and reliable.
+
+## Acceptance Criteria
+
+- [ ] QA stage runs script/test and checks exit code in Rust, not via an LLM agent
+- [ ] QA stage does not spawn a Claude process or consume API budget
+- [ ] QA pass/fail result is reported to the frontend the same way acceptance gates are
+- [ ] QA agent config in scaffolded project.toml is removed (only coder and mergemaster remain)
+- [ ] request_qa MCP tool triggers the Rust pipeline, not an agent spawn
+
+## Out of Scope
+
+- TBD