Task 301: Stats Refresh

Status: DONE

Description

Refresh stats in ai-costs and tech-overview reports after Task 300:

• Task count: 299→300
• TS tests: 2,206→2,221
• E2E tests: 219→222
• Total tests: 2,802→2,820
• Commits: 438+→440+
• Updated body text references and validation test assertions