Make Cockpit first-class and optional for v1

[smota]

Goal

Make Cockpit a first-class AgentFlow SDLC v1 product component while preserving runtime optionality.

Scope

• Add CLI entry for Cockpit startup and diagnostics.
• Add Cockpit release smoke gate.
• Package Cockpit assets and verify package contents explicitly.
• Document Cockpit as optional Goal Command Center in README/docs/SDLC definition/release gates.
• Expose Cockpit diagnostic command in harness adapter metadata.
• Keep default install/validation independent of a running Cockpit server.

Acceptance criteria

• agentflow-sdlc cockpit starts the server.
• agentflow-sdlc cockpit doctor --json validates config/package readiness.
• node scripts/cockpit-smoke.mjs passes without GitHub OAuth/write actions.
• pnpm validate:release includes Cockpit smoke.
• npm package manifest explicitly requires Cockpit server/docs/assets.
• README and docs state Cockpit is first-class but runtime optional.
• init, sync, doctor, validators, plugins, skills, and settings do not require Cockpit to be running.

[github-actions]

Integrated into development by PR #179: #179

Merge commit: 2d41931c89e8b07079a245e2e2a642dc86120013
Release/promotion to main is tracked separately.

[smota]

AgentFlow whole-model alignment

This issue was aligned with the current AgentFlow SDLC product model for screenshot/demo consistency.

• Product area: product:cockpit, product:harness
• Release assignment: v1.0.0 / release:v1.0.0
• Workflow state: Implemented on development; included in v1 release model.
• Compatibility rule: GitHub/CLI durable workflow remains authoritative; generated harness surfaces stay adapters only.
• Cockpit is treated as optional first-class Goal Command Center: package/release-gated, runtime opt-in, no unique state.

No implementation change is implied by this metadata-only alignment comment.