feat(agent-think): sync feature docs and resume on CI

[mattzcarey]

Summary

Adds a third agent-think skill for syncing user-facing pull request changes into cloudflare/cloudflare-docs.

• Inspects the source PR and identifies documentation impact from its behavior, commits, comments, and focused patches.
• Searches GitHub before creating a shallow, blobless sparse checkout of only the relevant docs pages and repository guidance.
• Opens a draft docs PR directly against production, reports one status comment on the source PR, and never clones the multi-gigabyte docs repository in full.
• Adds a general-purpose wake_up tool: a Think turn registers a stable external action ID and ends; AgentThink.wakeUp later submits the action result as a durable user message on the same thread.
• Correlates action IDs to sessions in a one-shot WakeUpRegistry Durable Object, with atomic delivery claims, event idempotency, collision protection, and stale-redelivery protection.

The private gh-app companion is deliberately narrower than the generic wake-up primitive: it accepts only workflow_run.completed for the CI workflow in cloudflare/cloudflare-docs, validates the bot-owned draft PR/branch/current SHA, mints a fresh installation token, and wakes the registered session. Failed docs CI can produce up to three automatic repair rounds; each follow-up push re-registers the same action ID.

This change is additive and inert on merge. The sync skill is not available to the deployed agent until it is explicitly seeded to R2, and no docs CI event can trigger a continuation until the private gh-app companion is deployed with the Workflow run subscription and cloudflare/cloudflare-docs installation access. Nothing from this branch has been deployed or seeded.

Testing

• pnpm run check
• pnpm --filter @cloudflare/agent-think test
• pnpm --filter @cloudflare/agent-think typecheck
• Companion gh-app: pnpm run affected:check

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Latest commit: cf7e51a

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commit: cf7e51a

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