[codex] Polish Agent Reliability Kit product surface

[aolingge]

Summary

• Polish the local-first Agent Reliability Kit CLI and docs for product-quality open-source use.
• Add local team audit, private MCP registry checks, n8n safety/backup scanning, and AI cost guard MVPs.
• Add launch, comparison, commercial support, demo, and roadmap docs.

Validation

• npm run check
• npm run smoke
• node dist/cli.js scan . --out .tmp/self-scan --format markdown,json,html,sarif,annotations --min-score 0

Safety

• No npm publish, GitHub release, destructive operation, real Slack webhook call, or secret use.
• Self-scan result: score 100, grade A, 0 findings.