TypeScript Lint

Incrementally fix TypeScript and build errors:

1. Run lint: dev/lint or dev/test-frontend

2. Parse error output:

   • Group by file
   • Sort by severity

3. For each error:

   • Show error context (5 lines before/after)
   • Explain the issue
   • Propose fix
   • Apply fix
   • Re-run build
   • Verify error resolved

4. Stop if:

   • Fix introduces new errors
   • Same error persists after 3 attempts
   • User requests pause

5. Show summary:

   • Errors fixed
   • Errors remaining
   • New errors introduced

Fix one error at a time for safety!

Language

• Internal reasoning and thinking should be in English
• All user-facing output, reports, and summaries must be written in Japanese