Added Codecov coverage gates, type-aware linting, and optional mutation testing

[CodyCBakerPhD]

Strengthened the deterministic quality gates around the existing Vitest/Playwright setup, keeping the app fully static and backend-free.

Coverage / Codecov

• Coverage now spans all of src/ (was src/lib/ only) with text/lcov/json reporters and ratchet thresholds (statements 30, branches 25, functions 34, lines 30) set just below current levels, so regressions fail locally before any upload.
• .github/.codecov.yml is unchanged from main. The upload step now passes files: ./coverage/lcov.info explicitly; kept the already-in-use codecov-action@v5.
• The quality gates moved into their own fail-fast Quality workflow (typecheck, lint, coverage, Codecov upload, all via npm ci); the Test workflow keeps just the Playwright integration job, so browser runs never block the upload. Chromatic workflows unchanged.

Quality gates

• ESLint is now type-aware (recommended-type-checked over src/ and configs/ via projectService) plus no-floating-promises, no-misused-promises, no-explicit-any, no-unnecessary-condition, await-thenable, complexity (15), and max-depth (4). All 19 surfaced violations were fixed for real (no rules downgraded to warn); the only inline disable is one justified webkitGetAsEntry browser-compat guard in dropzone.ts. ESLint/typescript-eslint were added as pinned devDependencies with a new npm run lint script.
• The pre-commit eslint hook is now a repo: local hook running the repo's own eslint from node_modules, so pre-commit and npm run lint share one environment. An isolated hook environment cannot see the app's dependency types (TypeScript ignores NODE_PATH), which is how pre-commit.ci's run produced a wrong auto-fix (reverted here); pre-commit.ci skips the hook and the npm run lint CI step enforces linting.
• Optional Stryker mutation testing: npm run test:mutation with config at configs/stryker.config.json. Not a CI gate (slow); mutation score, not raw coverage, is the real signal of test quality.
• Version bumped to 1.0.6 with CHANGELOG entries.

Manual maintainer step required: re-link Codecov after the repo rename
Uploads currently land on the old ember-uploader identity; the CI log says "results will be available at app.codecov.io/github/brain-bbqs/ember-uploader/commit/...". That is why Codecov has posted no PR comments or statuses since the rename to bbqs-uploader (last seen on #30). To fix:

1. Log in at app.codecov.io and re-sync the brain-bbqs org so Codecov picks up the rename.
2. Open the bbqs-uploader repo page in Codecov, copy its upload token from Settings.
3. Update the CODECOV_TOKEN secret in this repo's GitHub settings with that token.
4. Re-run the Quality workflow; the upload log should then point at .../bbqs-uploader/commit/... and PR comments/statuses will resume.

🤖 Generated with Claude Code

https://claude.ai/code/session_012RDb6yErzs3dYMFrEJhfH9

[chromatic-com]

Tip

All tests passed and all changes approved!

🟢 UI Tests: bbqs-uploader-storybook: 28 tests unchanged
🟢 UI Review: bbqs-uploader-storybook: 30 stories published -- no changes
Storybook Publish: bbqs-uploader-storybook: 30 stories published

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-28 03:04 UTC

[chromatic-com]

Tip

All tests passed and all changes approved!

🟢 UI Tests: bbqs-uploader-playwright: 2 tests unchanged
🟢 UI Review: bbqs-uploader-playwright: 2 tests published -- no changes
Test suite publish: bbqs-uploader-playwright: 2 tests published

[codecov]

Codecov Report

❌ Patch coverage is 7.69231% with 48 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/lib/etag-worker.ts	0.00%	25 Missing ⚠️
src/ui/processFile.ts	0.00%	9 Missing ⚠️
src/main.ts	0.00%	8 Missing ⚠️
src/workers/etag.worker.ts	0.00%	3 Missing ⚠️
src/ui/dropzone.ts	0.00%	2 Missing ⚠️
src/lib/upload-pipeline.ts	0.00%	1 Missing ⚠️

@@             Coverage Diff             @@
##             main      #57       +/-   ##
===========================================
- Coverage   56.32%   32.50%   -23.83%     
===========================================
  Files          16       26       +10     
  Lines         632     1529      +897     
  Branches      130      289      +159     
===========================================
+ Hits          356      497      +141     
- Misses        264     1032      +768     
+ Partials       12        0       -12     

Files with missing lines	Coverage Δ
src/lib/checksum-cache.ts	100.00% <100.00%> (+2.47%)	⬆️
src/lib/etag.ts	94.11% <100.00%> (+5.02%)	⬆️
src/lib/upload-pipeline.ts	1.85% <0.00%> (+1.85%)	⬆️
src/ui/dropzone.ts	0.00% <0.00%> (ø)
src/workers/etag.worker.ts	0.00% <0.00%> (ø)
src/main.ts	0.00% <0.00%> (ø)
src/ui/processFile.ts	0.00% <0.00%> (ø)
src/lib/etag-worker.ts	0.00% <0.00%> (ø)

... and 15 files with indirect coverage changes

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