Agent fix-handoff blocks + follow-up-issue suggestions

[JSONbored]

Phase 2 — Interactive control & issue intelligence

Context

We surface findings but don't help apply them. The contributor boundary forbids server-side writes to contributor code; the local-write-action-spec pattern (src/mcp/local-write-tools.ts) already lets the contributor's own agent execute actions.

Goal

Emit a machine-readable fix-handoff block per finding, and offer to file a follow-up issue for deferred findings.

Requirements

• Per finding, attach a structured "apply this fix" prompt block that the contributor's own local coding agent can consume — content only; execution stays on the contributor's machine (boundary-safe).
• A "file a follow-up issue" action via the existing gittensory_file_issue local-write spec for findings a maintainer wants tracked rather than blocked.
• Default-OFF; public-safe; no cloud/server write to contributor code.

Deliverables

• Handoff-block renderer + follow-up-issue action + tests + docs.

Expected outcome

• Findings become actionable without breaking the contributor boundary; less manual copy-paste.

Effort

M.

[linear-code]

JSO-2042