Lint and test runner tools with auto-detection

[tjdoomer]

Summary

• lint tool: auto-detect and run project linter, return structured diagnostics
• run_tests tool: auto-detect and run project tests, return structured results
• projectDetector.ts: scans for package.json, pyproject.toml, Cargo.toml, go.mod, Gemfile, Makefile
• outputParsers.ts: parse TypeScript, generic file:line:col formats

Test plan

• All 1873 tests pass, type-check clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1beb00a5-e9a9-4eb8-a696-ad84414eb837

📥 Commits

Reviewing files that changed from the base of the PR and between 617d7e6 and 3c1367c.

📒 Files selected for processing (6)

• docs/roadmap/09-lint-test-feedback.md
• packages/core/src/config/config.ts
• packages/core/src/tools/diagnostics/outputParsers.ts
• packages/core/src/tools/diagnostics/projectDetector.ts
• packages/core/src/tools/lint.ts
• packages/core/src/tools/runTests.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/lint-test-feedback

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