feat: harden release smoke and graph inspection

[cafitac]

Summary

• harden published install smoke for registry propagation by adding propagation-specific retry/backoff and npm/PyPI probe diagnostics
• dispatch CI validation when auto-release creates a bot-authored release-sync PR, and comment with the validation handoff
• add a read-only agent-memory graph inspect CLI for Relation-edge neighborhood inspection

Test plan

• uv run pytest tests/test_published_install_smoke.py tests/test_release_workflows.py tests/test_cli.py -q
• uv run pytest tests/ -q
• uv run python scripts/check_release_metadata.py
• uv run python scripts/smoke_release_readiness.py
• npm pack --dry-run
• git diff --check
• node --check bin/agent-memory.js
• PyYAML workflow parse for auto-release/publish/published-install-smoke
• static diff secret scan: finding_count 0