Task 343: Stats Refresh

Status: DONE

Update hardcoded project statistics after Tasks 337-342 (satellite perturbation, 3D viewer, etc.).

ai-costs.md: tasks 341→343, commits 480+→482+, TS tests 2,245→2,266, E2E 228→234, total 2,850→2,877
tech-overview.md: same stats + task count in body text
article-content-validation.test.ts: assertion values updated
All tests pass