Task 342: Stats Refresh

Status: DONE

Description

Update hardcoded project statistics after Tasks 335-341.

Changes

• ai-costs.md: commits 476+→480+, TS tests 2,235→2,245, total 2,840→2,850
• tech-overview.md: commits 476+→480+, TS tests 2,235→2,245, total 2,840→2,850
• article-content-validation.test.ts: assertions updated to match
• All 2245 TS tests pass