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+---
+name: "Per-file test coverage report with improvement targets"
+---
+
+# Story 474: Per-file test coverage report with improvement targets
+
+## User Story
+
+As a developer, I want `script/test_coverage` to save per-file coverage data so the `coverage` bot command can show the lowest-covered files as targets for improvement.
+
+## Acceptance Criteria
+
+- [ ] script/test_coverage saves per-file coverage data to .coverage_files.json (language-agnostic format)
+- [ ] Rust coverage: uses cargo llvm-cov --json to extract per-file line coverage
+- [ ] Frontend coverage: parses vitest coverage output for per-file data
+- [ ] coverage bot command shows top N lowest-covered files when cached data is available
+- [ ] Format is extensible for other languages (Go, Python, etc.) — each entry has file path and line coverage percentage
+
+## Out of Scope
+
+- TBD