feat(mcp): register a gittensory://enrichment-analyzers resource from REES analyzer metadata

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REES ships a generated analyzer taxonomy (review-enrichment/analyzer-metadata.json, generated from review-enrichment/src/analyzers/registry.ts) listing each analyzer's name, category (supply-chain/security/performance/ownership), cost class, and profiles. No MCP surface exposes it, so agents can't discover which enrichment analyzers exist or what categories they emit. Add a read-only MCP resource that serves this taxonomy.

Deliverables

• Register a gittensory://enrichment-analyzers resource in src/mcp/server.ts (mimeType application/json) that returns the analyzer taxonomy (name, category, cost class, default profiles)
• Read the taxonomy from the committed analyzer-metadata.json (or a shared exported constant) — do not re-import the REES runtime
• Tests: resource read returns the analyzers with categories present

References

• review-enrichment/analyzer-metadata.json
• review-enrichment/src/analyzers/registry.ts:39
• src/mcp/server.ts:1067

Part of #1499.

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size: S · held for later release (gittensor:feature once activated)

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JSO-2327