PR #158 code-reviewer recommendation. Records the dogfood-discovered
k8s multi-resource chunk_id collision + the deliberate decision NOT to
bump chunker_version (dogfood-only stage, single-resource k8s chunk_id
shift is benign churn). Cross-link added to p10-2 spec Risks/notes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>