Consolidate agent shutdown SSOT into CLAUDE.md lifecycle table

[michael-wojcik]

Context

PR #168 added agent shutdown lifecycle boundaries across 4 files: CLAUDE.md (lifecycle table), orchestrate.md (callout + qualified phase lines), comPACT.md (path-specific callout), and peer-review.md (shutdown timing table).

The per-workflow callouts provide good discoverability (the rule appears at the decision point), but they partially duplicate the CLAUDE.md lifecycle table. As the guidance evolves, maintaining consistency across 4 files creates a maintenance surface.

Proposal

Make CLAUDE.md's lifecycle boundaries table the sole SSOT. Replace per-workflow callouts with references: "> See Agent Shutdown Guidance in CLAUDE.md for lifecycle boundaries."

Trade-offs

• Pro: Single place to update shutdown rules; no risk of drift between files
• Con: Less discoverable — orchestrator must navigate to CLAUDE.md during workflow execution rather than seeing the rule in-context
• Mitigation: Keep brief contextual hints (1-line references) in workflow files pointing to CLAUDE.md

Affected files

• pact-plugin/CLAUDE.md (would become comprehensive SSOT)
• pact-plugin/commands/orchestrate.md (3 qualified lines + 1 callout → references)
• pact-plugin/commands/comPACT.md (1 callout → reference)
• pact-plugin/commands/peer-review.md (1 section → reference)

Source

Identified during PR #168 review by backend-coder reviewer.