S2 EsLint implementation

specs/in_review/S2_implement-eslint-for-fe

@@ -1,6 +1,6 @@
 # S2 — ESLint for the frontend
 
-Status: REFINED
+Status: IN_REVIEW
 
 Agreed after the grill-me review; shared understanding confirmed.
 
@@ -183,36 +183,43 @@ consistent. Record the performance evidence with the implementation documentatio
 
 ## Acceptance criteria
 
-- [ ] Compatible tooling checks maintained application TypeScript/JavaScript,
+- [x] Compatible tooling checks maintained application TypeScript/JavaScript,
       Angular templates, unit tests, Playwright tests and applicable frontend
       configuration using the agreed recommended and type-aware rules.
-- [ ] All existing violations are fixed; there is no legacy baseline allowance.
+- [x] All existing violations are fixed; there is no legacy baseline allowance.
       Frontend builds, unit tests and container end-to-end tests still pass.
-- [ ] `npm run lint` checks the full scope without modifications and fails on
+- [x] `npm run lint` checks the full scope without modifications and fails on
       either errors or warnings.
-- [ ] `npm run lint:fix` offers explicit local autofixes; CI does not modify source.
-- [ ] Formatting remains under Prettier, without conflicting ESLint rules.
-- [ ] Any necessary rule suppressions are narrow and concretely justified.
-- [ ] Every branch pipeline runs lint immediately after frontend `npm ci` and
+- [x] `npm run lint:fix` offers explicit local autofixes; CI does not modify source.
+- [x] Formatting remains under Prettier, without conflicting ESLint rules.
+- [x] Any necessary rule suppressions are narrow and concretely justified.
+- [x] Every branch pipeline runs lint immediately after frontend `npm ci` and
       before frontend tests/builds and container E2E; lint failure prevents
       publication and leaves actionable diagnostic output.
-- [ ] VS Code recommends ESLint without mandatory fix/format-on-save settings.
-- [ ] Complete-hook measurements cover the agreed single-file, mixed-file and
+- [x] VS Code recommends ESLint without mandatory fix/format-on-save settings.
+- [x] Complete-hook measurements cover the agreed single-file, mixed-file and
       all-maintained-files cases with fresh processes and no tool cache.
-- [ ] The measured three-second budget determines combined tools, Prettier-only
+- [x] The measured three-second budget determines combined tools, Prettier-only
       or no active hook; no writing formatter is forcibly interrupted to meet it.
-- [ ] If installed, the hook processes only applicable staged frontend files,
+- [x] If installed, the hook processes only applicable staged frontend files,
       applies Prettier formatting before any ESLint check, and preserves unrelated
       files and unstaged edits, including partially staged files.
-- [ ] A failed installed hook restores the original staged and unstaged state and
+- [x] A failed installed hook restores the original staged and unstaged state and
       blocks the commit with a concrete explanation.
-- [ ] Hook installation is automatic for local `npm ci` when applicable, skipped
+- [x] Hook installation is automatic for local `npm ci` when applicable, skipped
       in CI/Docker, and has documented local opt-out instructions.
-- [ ] Root `README.md` explains `npm run lint`, `npm run lint:fix`, CI enforcement
+- [x] Root `README.md` explains `npm run lint`, `npm run lint:fix`, CI enforcement
       and the selected hook behavior; measurement evidence is included.
 
 ## Implementation handoff
 
-This specification records agreed behavior. It does not install ESLint, change
-application code, modify the pipeline, install a hook or update command usage in
-the README yet. Those changes and the timing measurements are implementation work.
+The agreed behavior has been implemented and is ready for review. See the
+implementation evidence below.
+
+## Implementation evidence
+
+Implemented with ESLint flat configuration, type-aware TypeScript and Angular
+template checks. The measured three-second budget selects a Prettier-only
+Husky/lint-staged hook; ESLint remains mandatory in the Java-based pipeline.
+See [validation and timings](../../docs/s2-validation.md) for scope, preservation
+checks, local installation and successful builds/unit/container E2E tests.