P2-G: Curiosity Broadcasting & Smart Interest Sharing (DELIVERS: distributed learning without hallucination)

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Why: When knowledge gaps are detected, CORTEX must be able to broadcast the incomplete Metroid as a curiosity probe to connected peers. Peers respond with relevant fragments, enabling collaborative learning. Additionally, interest sharing is a core product value for both app and library surfaces. v1 must share public-interest graph sections while preventing personal data leakage.

• P2-G0: Implement sharing/CuriosityBroadcaster.ts

  • Consume pending CuriosityProbe objects queued by KnowledgeGapDetector
  • Serialize and broadcast to connected peers via P2P transport
  • Handle responses: deserialize incoming graph fragments; pass to SubgraphImporter for integration
  • Rate-limit broadcasts to prevent spam
  • Include knowledgeBoundary field in probe so peers can target search precisely

• P2-G1: Implement sharing/EligibilityClassifier.ts

  • Classify candidate nodes as share-eligible vs blocked before export
  • Detect identity/PII-bearing content (person-specific identifiers, credentials, financial/health traces)
  • Emit deterministic eligibility decisions with reason codes for auditability

• P2-G2: Implement sharing/SubgraphExporter.ts

  • Build topic-scoped graph slices from eligible nodes only
  • For curiosity responses: select graph fragment relevant to the received probe's knowledgeBoundary
  • Preserve node/edge signatures and provenance
  • Strip or coarsen personal metadata fields that are not needed for discovery

• P2-G3: Implement sharing/PeerExchange.ts and sharing/SubgraphImporter.ts

  • Opt-in peer exchange over P2P transport
  • Verify signatures and schema on import; reject invalid or tampered payloads
  • Merge imported slices into discovery pathways without exposing sender identity metadata
  • After import, retry MetroidBuilder for any pending knowledge gaps that may be resolved by new data

• P2-G4: Add sharing safety and discovery tests

  • tests/sharing/EligibilityClassifier.test.ts
  • tests/sharing/CuriosityBroadcaster.test.ts
  • tests/sharing/SubgraphExchange.test.ts
  • Assert blocked nodes are never exported; assert imported fragments are discoverable via query
  • Assert that after receiving a response to a curiosity probe, MetroidBuilder can now construct m2 for the previously-gapped topic

Exit Criteria: v1 can broadcast curiosity probes for knowledge gaps, receive graph fragments from peers, retry MetroidBuilder with new data, and exchange signed public-interest slices with PII blocking.