Feed the reviewer a distilled digest of the Sea Haven engineering-handbook
so findings reflect our naming, commit, PR, secrets, and IaC conventions
instead of generic code-review judgment.
A new handbook module keeps an app-managed shallow clone of the (private)
handbook, distills the review-relevant pages into a compact conventions
checklist via the Fireworks model once a day, caches it under ~/.cache,
and hands it to the reviewer to inject into every review's system prompt.
The refresh runs in-process at the start of each worker cycle; failures
keep the last good digest and back off, so a handbook outage never blocks
reviews. Set HANDBOOK_ENABLED=false to disable.
Extract a shared fireworks_complete helper used by both the reviewer and
the distiller, so the handbook provider needs no reviewer reference and
the guidance callable is set once at construction. Clone auth uses a
Basic http.extraHeader (GitHub git-over-HTTPS rejects Bearer), and the
distiller wraps its answer in delimiters to strip a reasoning model's
chain-of-thought preamble. Adds GET /api/handbook and a header status
line. Stdlib-only, no new dependencies.
