story-kit: queue 121_story_test_coverage_io_watcher_rs for QA

.story_kit/work/2_current/121_story_test_coverage_io_watcher_rs.md

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-name: "Add test coverage for io/watcher.rs (40% -> 70%+)"
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-
-# Story 121: Add test coverage for io/watcher.rs
-
-Currently at 40% line coverage (238 lines, 142 missed). The file watcher is critical infrastructure — it drives pipeline advancement and auto-commits.
-
-## What to test
-
-- Story file detection and classification (which directory, what kind of move)
-- Debounce/flush logic
-- Git add/commit message generation
-- Watcher pause/resume mechanism (added in story 119 for merge safety)
-- Edge cases: rapid file changes, missing directories, git failures
-
-## Notes
-
-- Use temp directories for filesystem tests
-- Mock git commands where needed
-- The watcher pause lock is especially important to test given its role in merge safety
-
-## Acceptance Criteria
-
-- [ ] Line coverage for `io/watcher.rs` reaches 70%+
-- [ ] Tests pass with `cargo test`
-- [ ] `cargo clippy` clean