## Summary
- Raise the Basic Agent (free tier) message quota from 5 to 10 per
window.
- Add `src/lib/free_agent_quota_limit.ts` as the single source of truth;
IPC re-exports the constant.
- UI (selector, banner, chat error) uses `messagesLimit` from quota
status so copy stays in sync.
- Update `e2e-tests/free_agent_quota.spec.ts` for the new limit and
strings.

## Test plan
- `npm run fmt && npm run lint:fix && npm run ts`
- `npm test` (vitest)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude <noreply@anthropic.com>