[salmonumbrella]

What changed

• Adds an optional model-written summary for a stored Friction Log digest using the existing insights generators.
• Saves the summary for the digest and generator, lets users regenerate it, and labels it as model-written. It cannot change findings, digests, recurrence, or issues.

Why

A digest can be long. An opt-in overview helps a reader spot the main patterns while the deterministic findings and linked sessions remain the evidence.

Usage

Open a digest and choose Generate summary. The model receives digest counts, selected pattern titles, and P0 alerts, which may contain session IDs and brief text from a correction, workaround, or deferral. It does not receive finding text, evidence, or transcripts.

Part 8 of 15 in the stacked Friction Log series. Depends on #1937. GitHub shows the cumulative diff against main; review the PR08-only diff. Merge PR07 first. Refresh this branch against main and confirm its diff is scoped to PR08 before merging.

Refs #1908

[roborev-ci]

roborev: Combined Review (425207a)

Verdict: Changes require fixes for 3 findings.

High

• internal/sync/engine.go:19568: Incremental writes with signalsMaintained == false never enqueue friction recomputation, leaving friction findings stale after new messages or tool results. Queue friction recomputation for every successful incremental write, independently of signalsMaintained.

  Reported by: codex

Medium

• internal/postgres/friction_digest.go:27: The PostgreSQL capability probe checks only digest tables, while friction_findings and friction_session_dims are also read unconditionally, allowing partial schemas to be advertised as available and fail at runtime. Include friction_findings and friction_session_dims in the capability checks.

  Reported by: codex

• internal/db/friction_list.go:108: ListFrictionFindings queries friction_findings unconditionally, so read-only SQLite archives without the optional table return a 500 instead of an empty result. Check hasFrictionTables before querying and return an empty page when the optional tables are absent.

  Reported by: codex

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Reviewers: 2 done | Synthesis: codex, 5s | Total: 14m19s