feat(nexus): implement sharded architecture
- Create nexus-mcp/ with 6-shard plugin model (identity, workday, audit, itsm, assets, logistics)
- Migrate 31 tools from legacy Identity + Workday servers into unified orchestrator
- Add feature flag control (ENABLE_*) for atomic shard deployment per Gemini design
- Implement SOC 2 audit logging with automatic PII redaction (CC7.2 / CC6.1)
- Create stub shards for ITSM, Assets, Logistics (Red status awaiting credentials)
- Add comprehensive mock data library with drift scenarios for credential-free testing
- Update README.md: reposition from Workday-MCP to Nexus-MCP as primary server
- Document installation, configuration, and shard toggling in Local-Setup.md
Architecture: Orchestrator (main.py) + Shards (src/shards/*.py) + Adapters (lib/)
enables piece-at-a-time deployment. Mock mode (USE_MOCK=true) supports full 53-tool
testing without credentials. Smoke test verified: 33 tools registered successfully.
BREAKING CHANGE: Legacy Identity/ and Workday/ servers deprecated. Users must update
Claude Desktop config to point to nexus-mcp/src/main.py. Legacy folders preserved
for reference pending verification.
Refs: WIS-006, WIS-009, WIS-014-018, Gemini conversation 2026-04-06
nathan
0c9aebf97a