Integrate Phase 1 changes from upstream validators:
- 11 new MCP categories + 2 new A2A categories from upstream
- 3 new MCP entries + 3 new A2A entries
- 44 new error codes in SeverityClassifier (EVT, URI, REG, VAL)
- A2A→ERC-8004 derivation in AssessmentPipeline
- ~19 new tests
Depends on: FlowMCP/x402-mcp-validator, FlowMCP/a2a-agent-validator, FlowMCP/erc8004-registry-parser
Integrate Phase 1 changes from upstream validators:
Depends on: FlowMCP/x402-mcp-validator, FlowMCP/a2a-agent-validator, FlowMCP/erc8004-registry-parser