v8.8.1-dev.6

• Merge pull request #1669 from kaitranntt/kai/docs/1666-pruning-freshness
• Merge pull request #1668 from kaitranntt/kai/docs/1665-architecture-contracts
• Merge pull request #1667 from kaitranntt/kai/docs/1664-ai-contributor-guidance
• test(docs): enforce documentation freshness
• fix(metrics): enforce exact runtime inventory
• docs(roadmap): replace historical trackers with live guidance
• docs(hygiene): remove superseded local guides
• docs(macos): consolidate CCS Bar maintainer guidance
• docs(config): preserve active developer contracts
• docs(readme): route user guides to canonical docs
• docs(operations): refresh runtime contracts
• docs(architecture): reconcile provider and target contracts
• docs(product): refresh product and release contracts
• docs(contributing): align test and UI guidance
• docs(architecture): replace volatile maintainer snapshots