feat(config): add review.enrichment analyzer per-lane toggles

[JSONbored]

Add review.enrichment — a per-repo mapping of REES analyzer names to bool, letting operators enable/disable individual enrichment analyzers (static-analysis, coverage-delta, breaking-change, etc.) declaratively rather than a single opaque on/off. Absent ⇒ current default set (byte-identical). Decomposed from #1959/#1680; the config surface for the #1499 analyzers.

Deliverables

• Add enrichmentAnalyzers: Record<string, boolean> to FocusManifestReviewConfig in src/signals/focus-manifest.ts, parsed as a mapping of known analyzer keys to booleans (warn+drop unknown keys)
• Resolve the per-analyzer toggles at the enrichment wiring site (src/review/enrichment-wire.ts) so a disabled analyzer is skipped; unset ⇒ existing default set
• Wire reviewConfigToJson round-trip + present + EMPTY literals
• Unit tests: enable/disable per analyzer, unknown-key warning, empty=defaults byte-identical; branch coverage on the per-key arms
• Document the analyzer keys + defaults in .gittensory.yml.example

References

• src/review/enrichment-wire.ts
• src/signals/focus-manifest.ts:558 (parseSettingsOverride mapping pattern)
• part of #1959 / #1680 (epic #1953); config surface for #1499

Part of #1959.

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size: M · gittensor:feature

[linear-code]

JSO-2167