feat(P03): trace digest + GradeStore (Wave 1)
Task 3-1-01: grading/features.py — compute_digest (D-028): deterministic features
(test pass/fail + final status w/ run_result exit-code fallback, edit count, error/fix
cycles + mean fix latency, idle gaps, command category histogram, session duration,
first-test-pass offset). TraceDigest pydantic model: bounded, no raw commands/contents/
payloads — raw trace never reaches the LLM (leak test enforces). Tolerates both live
trace mixes (activity+file_diff daemon topology; REPL kinds).
Task 3-1-02: grading/store.py — GradeStore protocol + SQLiteGradeStore (D-027 pattern:
WAL, tz-normalization, detached rows); upsert-latest-wins on regrade (documented
contrast vs TraceStore's append-only dedup).
20 grading tests green; suite 238 green (reconnect-flush flake under load fixed with a
20s deadline); ruff clean.
---ci---
phase: 3
milestone: v0.3
status: execute
requirements: {covered: [REQ-3-004], partial: []}
---/ci---
CIAgent
0fccb8d250