Task 355: Fix Diagram Review Warnings and Stats Refresh

Status: DONE

Summary

Fixed 5 diagram review warnings for static Hohmann reference transfers in animated diagrams, updated tech-overview stats, and fixed a pre-existing test failure.

Changes

1. Fix tech-overview body text: Task count 353→355, TS test count 2,326→2,328, total tests 2,947→2,949
2. Fix review-diagrams.ts: Skip startTime/endTime warning for style: "hohmann" transfers in animated diagrams — these are intentionally static reference lines, not animatable transfers
3. Add diagram review tests: Two new tests in review-diagrams.test.ts:

- Verify non-hohmann transfers in animated diagrams have proper timing

- Verify hohmann reference transfers are intentionally untimed

1. Stats refresh: All counts updated to reflect current state (355 tasks, 2,949 tests, 496+ commits)

Context

The diagram review tool (npm run review-diagrams) was reporting 5 false-positive warnings for Hohmann transfer reference lines in animated orbital diagrams. These Hohmann arcs are drawn as static ellipses for visual comparison against the actual brachistochrone routes — they don't animate and don't need startTime/endTime.