docs(config): add exhaustive commented .gittensory.full.yml template

[JSONbored]

Add a .gittensory.full.yml exhaustive template listing every supported gate:, settings:, review:, and features: option with defaults, comments, and allowed values, so a maintainer can answer 'what can I configure?' from the file alone. Scoped-down slice of #1670/#1682: the EXHAUSTIVE template only.

Deliverables

• Add .gittensory.full.yml covering every current gate/settings/review/features field with inline comments for defaults + allowed values
• Add a snapshot/parse test proving the exhaustive template parses and round-trips through parseFocusManifest without warnings
• Cross-check the field inventory against parseGateConfig/parseSettingsOverride/parseReviewConfig/parseFeaturesConfig so the template cannot drift
• Link the template from the self-host configuration docs

References

• src/signals/focus-manifest.ts:392 (parseGateConfig)
• src/signals/focus-manifest.ts:558 (parseSettingsOverride)
• src/signals/focus-manifest.ts:653 (parseReviewConfig)
• .gittensory.yml.example
• part of #1670 / #1682 (epic #1680)

Part of #1682.

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size: S · gittensor:bug

[linear-code]

JSO-2172