Task 2 ledger: Leaderboard reads the peak

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: Evan Phyillaier

docs/superpowers/plans/2026-08-08-v1.10-qol-notes.md

@@ -43,3 +43,9 @@ _Each task appends here: what changed, decisions made, anything deferred._
 - Decisions/deviations: Initial placement violated brief requirement; corrected. Durable across Migrate/Singularity; wiped by hardReset (correct behavior).
 - Tests: `TEST_BACKEND=sqlite npx vitest run tests/reducer.meta.test.js tests/state.test.js` → 49 passed
 
+### Task 2: Leaderboard reads the peak
+- Commits: e15fe5f
+- Changed: Updated `legacyCores` board reader in `server/leaderboardService.js` to read `(meta.stats && meta.stats.bestLegacyCores) || 0`; added tests to `tests/api.social.test.js`; updated label in `client/src/game/components/social/LeaderboardSection.jsx` to "Legacy Cores (best)"
+- Decisions/deviations: none
+- Tests: `TEST_BACKEND=sqlite npx vitest run tests/api.social.test.js` → 9 passed, full suite → 705 passed
+