feat(FN-1540): add lint as inline quality gate in task prompts

- Add ESLint configuration (eslint.config.mjs) for TypeScript/JavaScript linting
- Update executor prompts to include lint instruction before code submission
- Add lint check to triage prompt validation workflow
- Update agent prompts to emphasize lint compliance as quality requirement
- Add lint tool to agent toolset with file-level rule disabling capability
- Include lint in CI workflow with non-blocking status
- Update tests to verify lint-inclusive prompt behavior
- Add documentation for lint integration in contributing.md
- Add changeset for @gsxdsm/fusion minor release

docs/contributing.md

@@ -40,11 +40,21 @@ pnpm build
 ```bash
 pnpm dev          # build + run CLI entrypoint in dev mode
 pnpm dev:ui       # dashboard dev server only
+pnpm lint         # lint all packages
 pnpm typecheck    # workspace typechecks
 pnpm test         # workspace test suite
 pnpm build        # workspace builds
 ```
 
+## Quality Gate Checklist
+
+Before submitting changes, verify:
+
+- [ ] `pnpm lint` — lint passes with no errors
+- [ ] `pnpm test` — all tests pass
+- [ ] `pnpm typecheck` — type checking passes
+- [ ] `pnpm build` — builds successfully
+
 ## Testing Requirements
 
 Use real test runs (not manual verification substitutes):