v0.2.0 — Phase 10 + 11 buyer-side surfaces

Highlights

5 new MCP tools for AI assistants:

• purchase_enterprise_license — Phase 10 bulk-license purchase (filtered/platform_wide/custom scope)
• list_feed — paginated catalog browse with since= delta-feed
• stream_feed_ndjson — bulk-export via Phase 11 M3 NDJSON wire format
• get_audit_events — per-event audit ledger with Tempo on-chain inclusion proofs inline
• get_compliance_dossier — Phase 11 M4 procurement-defense dossier

get_content extended to surface 7 Phase 11 M2 RAG metadata fields explicitly.

New env vars: OPEDD_ACCESS_KEY (eak_*), OPEDD_BUYER_JWT (Supabase JWT).

CI workflow added (Node 18/20/22 matrix). README repositioned as licensed content retrieval for AI agents.