feat(gre): observed Performance on the dashboard (pin bump + docs)

[f15cubing]

Intent (fast lane)

Wire the GRE dashboard's Performance slot to a real score instead of the stale "Arrives Thursday" placeholder. Pure Qt-UI + a read-only view-model that pools the exam attempts Exam Mode already persists to a profile side-file and renders them as a Wilson range. No collection mutation, no scheduler/undo/store, three scores stay separate — so it rides the fast lane.

Summary

• Bumps the anki submodule pin d11b424 → b7cf7c2 (feat(gre): surface observed Performance on the dashboard anki#3), which:
  • replaces the placeholder with observed rights-only accuracy as a Wilson range + n via the existing CalibrationStrip
  • adds pure load_exam_attempts() + observed_performance() to dashboard_data.py; greDashboardData reads the side-file best-effort (read-only)
  • ScoreSlot gains an observed state; the no-fabrication guard still collapses any range-less state to not_available
• Docs (same change): qt.md (§ Observed Performance + footer SHA), models/performance.md (§ Live surface — observed vs the calibrated eval-only model), INDEX.md (dashboard row), STATUS.md (in-flight).

Honesty ceilings

Always a range, never a bare point; a give-up state (never a fabricated 0) with no attempts; scores never blended; deliberately the observed low-n surface, not the calibrated scoring/performance.py model.

Test plan

• ./ninja check_svelte green (anki PR)
• ./ninja check_pytest_aqt green; dashboard test files 23/23 (9 new)
• Read-only invariant: endpoint only reads the mastery RPC + the side-file; no OpChanges
• Live GUI smoke of the Performance slot with a real timed mock (human-gated)

Notes / follow-ups

• Stacked on the current pin: anki PR bases on agent/exam-preset-fix (= d11b424); retarget to anki main once that merges.
• Follow-up: carry observed Performance into the synced gre_scorecard (Android panel still not_available).
• Pre-existing ruff-format debt in dashboard_data.py/mediasrv.py at the base is left untouched (additions are clean).

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