feat(gre): pin desktop scoring adapter (Task 6) + codebase docs

[f15cubing]

What & why

Bumps the anki submodule pin (277f12e → ed74d1f) to include the Task 6 desktop scoring adapter, and updates codebase docs. The adapter writes the synced three-score gre_scorecard on GRE dashboard open (Memory range; Performance not-available; Readiness gated with evidence panel — never blended, never a bare number).

Depends on: f15cubing/anki#2 (the adapter change). Merge that first, then reconcile this pin to the squash-merged anki SHA before merging this PR.

Area(s) touched

anki submodule pin (277f12e → ed74d1f), docs/codebase/qt.md, docs/codebase/INDEX.md, scoring/scoring.md — engine/Rust PR? yes (submodule pin bump; underlying change is Qt-UI Python, no Rust).

Docs updated

docs/codebase/qt.md (§ scoring adapter + dashboard trigger note), docs/codebase/INDEX.md (dashboard/scoring rows + footer SHA), scoring/scoring.md (Task 6 shipped); Last-verified → f15cubing/anki@ed74d1f. docs/STATUS.md line added on merge (hot file — avoids conflicts with concurrent PRs).

Test evidence

See f15cubing/anki#2: 3 adapter/trigger tests + 32 GRE aqt tests (no regression); ruff/format/mypy clean; headless round-trip smoke (scorecard persists across close/reopen — no corruption; Readiness gated with reasons). This PR is pin + docs only (no outer-repo code).

Engine/Rust extra gate

No Rust change — pin bump of a Qt-UI-only anki change (ceiling notes in anki#2: undo preserved via set_config(undoable=False); no schema change; mastery read path unchanged / no OpChanges from reads; adapter's only write is the gre_scorecard config). Merge difficulty: low. Reconcile the pin to the squash-merged anki SHA after anki#2 merges.

Made with Cursor

[f15cubing]

Engine-lane review companion to anki#2 (different agent). Pin + docs look right — not merging.

• Pin — PASS. anki bump 277f12e -> ed74d1f matches the anki#2 tip commit (Task 6 adapter).
• Docs — PASS. Updated in this PR and consistent with the code: docs/codebase/qt.md (§ GRE scoring adapter + dashboard on-open trigger), docs/codebase/INDEX.md (dashboard/scoring rows + footer Last-verified -> ed74d1f), scoring/scoring.md (Task 6 marked shipped).
• Scope — PASS. Pin + docs only (4 files); MERGEABLE.
• Process notes acknowledged — PASS. Body states: reconcile the pin to the squash-merged anki SHA after anki#2 merges, and the docs/STATUS.md line is deferred to merge-time (hot file). Both acceptable.

Depends on anki#2 landing first. Not merging, per instructions.