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UI opt-in for git-sync, mirroring the existing sharing/comments settings pattern (no new endpoint, no new mechanism; orchestrator read query untouched): - UpdateSpaceDto.gitSyncEnabled?: boolean. - SpaceRepo.updateGitSyncSettings: jsonb-merge into settings.gitSync.<key> (COALESCE || jsonb_build_object — never clobbers sibling sharing/comments); stored as a real jsonb boolean so the orchestrator's settings->'gitSync'->>'enabled' = 'true' matches. - SpaceService.updateSpace handles the flag (audit diff) via the existing CASL-guarded space update path (Manage/Settings). - client: Switch in edit-space-form (optimistic mutate + revert-on-error, readOnly-aware) + space types + 2 i18n keys. - space.service.spec extended (calls updateGitSyncSettings; no-op when undefined). tsc clean (server+client); jest src/core/space 4 pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>