feat(branch-archaeology): add machine-readable branch archaeology artifacts and docs

[cto-new]

Summary

This change introduces a semantic knowledge graph of repository branches by auditing 260 remote branches and emitting machine-readable representations (JSON-LD, YAML-LD, TTL). It adds human-readable documentation (BRANCH_ARCHAEOLOGY.md, BRANCH_ANOMALIES.md), a metadata index (branch_archaeology_meta.yaml), and a regeneration tool (tooling/branch_archaeologist.py). It preserves the branch stratigraphy for agent learning, documents the CoPilot_Experiment_0 and CatCleanup convergence anomaly, and places data under knowledge_core/ with a discoverable docs layout. It includes a quick reference and a summary artifact for operational transparency. No breaking API changes.

Details

• Audited 260 remote branches; inferred statuses, relationships, version series, and purposes
• Generated machine-readable outputs: knowledge_core/branch_archaeology.jsonld, knowledge_core/branch_archaeology.yaml, knowledge_core/branch_archaeology.ttl
• Created knowledge_core/branch_archaeology_meta.yaml metadata linking machine and human outputs
• Added BRANCH_ARCHAEOLOGY_QUICKREF.md and BRANCH_ARCHAEOLOGY_SUMMARY.md for quick reference and summary
• Added human-readable docs: docs/BRANCH_ARCHAEOLOGY.md and docs/BRANCH_ANOMALIES.md
• Implemented regeneration tool: tooling/branch_archaeologist.py
• Documented CoPilot_Experiment_0 and CatCleanup convergence as deliberate fork-from-cleanup pattern
• Prepared for L2 repository sync and agent queries; data is discoverable under knowledge_core/ and docs/

Warning: Task VM test is not fully passing, using partial setup (3/3 steps working)