story-kit: queue 69_story_test_coverage_qa_gate for merge

.story_kit/work/3_qa/69_story_test_coverage_qa_gate.md

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----
-name: Test Coverage QA Gate
-test_plan: approved
----
-
-# Story 69: Test Coverage QA Gate
-
-## User Story
-
-As a developer, I want a `script/test_coverage` script that collects and reports test coverage for both Rust and frontend code, so that it can be run as a QA gate when a work item enters `3_qa/`.
-
-## Acceptance Criteria
-
-- [ ] `script/test_coverage` exists and is executable
-- [ ] It runs Rust tests with coverage collection (e.g. `cargo llvm-cov` or `cargo tarpaulin`) and reports line coverage percentage
-- [ ] It runs frontend tests with coverage collection (e.g. `vitest --coverage`) and reports line coverage percentage
-- [ ] The script exits non-zero if coverage is below a configurable threshold (default: the current baseline, so coverage can only go up)
-- [ ] The QA stage (`3_qa/`) in the server pipeline runs `script/test_coverage` as a gate check
-- [ ] Work items cannot progress from `3_qa/` to `4_merge/` if the coverage gate fails
-
-## Out of Scope
-
-- Per-file or per-function coverage reporting
-- Coverage badges or dashboards
-- Branch coverage (line coverage is sufficient for now)