Route owned PR events to babysitter sessions

[miyaontherelay]

Summary

• route canonical GitHub review, review-comment, issue-comment, failed-check, conflict, and base-divergence activity only to the babysitter that owns the exact normalized repo and PR
• coalesce metadata-only wakes with confirmed delivery, retry, critical-section fencing, and pull/poll correctness backstops
• persist exact babysitter ownership, pending wake categories, and critical fences across process restarts

Stack

Depends on #89. This PR is intentionally stacked on branch codex/issue-82-repo-agent-names and preserves its repo-qualified agent naming plus composite issue identity. It must not target main until #89 merges; after that, it requires rebase/integration and a fresh frozen shadow delta audit before changing the base.

Fixes #87

Security and lifecycle

• canonical flat review, comment, and check records require consistent path object ID plus validated repo and PR identity; mismatched or ambiguous records fail closed
• provider-authored titles, bodies, comments, URLs, check names, and control text are excluded from wake prompts
• pending and green checks do not wake; failed, cancelled, and timed-out checks do
• an explicit confirmed Factory ACK causally installs and durably records the no-submit fence before destructive babysitter work
• terminal close/completion cancels queued work and clears durable session state

Validation

• focused babysitter, prompt, durable-state, and CLI tests: 41 passed, 309 skipped
• full test suite: 38 files, 759 passed
• npm run build
• npm pack --dry-run --json: 262 files with dist main/types and CLI bin
• git diff --check
• independent frozen shadow audit: signed off exact binary diff SHA-256 c1b5fbe992859fd43ba1a765abd0a956cea8ffb7e4880142d04b9fdd2c40fa05

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