feat: start verified knowledge ledger MVP

[chenmingtang830]

Summary

• add a production-based proofpress knowledge CLI vertical slice
• ingest compact OTLP JSON into source-event and experiment nodes
• deterministically propose claims and expose evidence/completeness admission gates
• record human review/admission decisions and materialize fresh-agent context
• include a three-experiment Coframe-style fixture and tests

Partner demo boundary

The Cold Handoff review build remains reusable as a read-only continuation/review UI shell. This PR does not copy or claim its captured replay as ledger evidence. The next integration can replace its static run selector with this ledger's context/claim graph while retaining its honest CONTINUE / RECHECK / REFUSE interaction model.

Verification

• npm test (67 Python tests, 5 Node tests)
• python3 proofpress.py knowledge ingest examples/verified-knowledge-ledger/demo.otlp.json -o /tmp/coframe-ledger.json
• blocked failed experiment cannot be accepted by the gate

[github-actions]

Proofpress

examples/verified-knowledge-ledger/demo.html
fewer than two ledger versions — nothing to diff yet
⚪ no claims recorded for this version (snapshot ran without --claims)

examples/verified-knowledge-ledger/demo.partner-style.html
e8387a21 → ee2f6fc4 ▍ 1 added

• 🟢 new ·

  Evidence stays attached to the ·

  The decision is a path, not a note.<

changelog: feat: embed lineage explorer in continuation demo
⚪ no claims recorded for this version (snapshot ran without --claims)