Implements the fix-or-disagree agent loop behind pr-respond: batched
one-run-per-cycle over actionable threads (filtering resolved/outdated/
self/bot), with prompt-injection delimiting of untrusted comment bodies,
viewer-authenticated anti-spoof markers, a pre-push secret scan, fast-
forward-only push (no force-push path) with non-ff abort+re-batch, reply+
resolve, commit-last thread-state persistence with marker+SHA crash
recovery (R15), and an iteration cap on responseRounds (R8). GitHub/git/
agent ops injected; engine stays dashboard-import-free. Adds GraphQL
getPrReviewThreadsDetailed + getViewerLogin to the client. 23 tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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