feat(mcp): register a gittensory://slop-rules resource enumerating deterministic slop findings

[JSONbored]

gittensory_check_slop_risk (src/mcp/server.ts:1197) returns per-call findings, but there is no discoverable catalog of the deterministic slop rule codes + their bands (clean/low/elevated/high) that the detector can emit (defined via the as const maps in src/signals/slop.ts:55 and :357). Expose a static read-only MCP resource enumerating the rule codes, bands, and one-line rationale so an agent can pre-plan against them without triggering a call.

Deliverables

• Register a gittensory://slop-rules resource in src/mcp/server.ts (application/json) returning the slop rule/band catalog
• Source the codes/bands from the existing exported const in src/signals/slop.ts (single source of truth — no duplicated literals)
• Tests: resource read returns every band and rule code present in the const

References

• src/signals/slop.ts:55
• src/signals/slop.ts:357
• src/mcp/server.ts:1197

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

[linear-code]

JSO-2338