Wire Auto Review lifecycle state into durable store

[shiny-code-bot]

Summary

• Persist TUI Auto Review launch, start, active/inactive status, skip, stale-loss, and terminal completion updates into the durable AutoReviewRun store.
• Persist exec-observed Auto Review agent lifecycle updates into the same store, reusing existing rows by agent id after restart and enriching rows with heuristic summaries plus structured output sidecars when available.
• Bound stored finding digests for future low-token ledger use while keeping full structured review output in sidecars.
• Reconcile orphaned in-flight runs on TUI/exec startup so restarts do not leave stale rows looking active.

Validation

• cargo test -p code-core review_store
• ./build-fast.sh
• git diff --check

Agent Review Notes

• Agents reviewed the slice for lifecycle correctness and long-term Auto Review goals.
• Addressed review feedback by adding startup reconciliation, stale-run loss marking, exec row reuse by agent id, heuristic exec finding summaries, and bounded finding digests.

Closes #326