Adds /api/pull-requests routes (list, detail, merge/approve/retry/close/
automerge — all re-fetch authoritative state before acting), a
PullRequestView rendering every entity state distinctly (creating/failed/
unverified/responding/await-review/conflict) with the action bar, live
auto-merge gate reason, and conflict CTA; TaskCard PR node-state badge +
link; and the R16 column-move-backward guard. User actions route through
the existing releaseHeldTaskByEvent primitives. Maps the new PR node kinds
in the workflow editor's kind resolver. 13 route tests + lazy-view guard
green; component test runs in CI.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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