Align or document gittensory's screenshotTableGate presence-only mode vs metagraphed's matrix

[JSONbored]

Context

gittensory's screenshotTableGate (private VPS config) sets only enabled/whenPaths/action: close — no requireViewports/requireThemes/skillFileUrl. This makes evaluateScreenshotTableGate() fall back to the weaker PRESENCE check (some image-bearing table, not a completeness matrix) — structurally the same mode that let PR #4661 slip 4/12 required images past metagraphed's gate before #4535/#4540 fixed it there. gittensory's config has zero comment justifying staying in this weaker mode.

Important: metagraphed's exact fix (a full [Desktop, Tablet, Mobile] × [Light, Dark] matrix) cannot be copied verbatim — gittensory-ui is a documented dark-mode-only build (no theme dimension exists) and its own contributor skill (.claude/skills/contributing-to-gittensory/SKILL.md Phase 7) documents a flexible, change-scoped viewport policy, not a fixed matrix. Copying metagraphed's config would false-close valid PRs over impossible light-mode screenshots.

Requirements

• Do not copy metagraphed's exact matrix config verbatim (dark-mode-only UI makes the theme dimension inapplicable).
• Two parts: a direct VPS config decision/edit, and a public-repo doc fix.

Deliverables

VPS (edge-nl-01), pick one:

• Minimal: add a comment to gittensory's screenshotTableGate block explaining it intentionally stays presence-mode (dark-mode-only UI, flexible viewport policy per SKILL.md Phase 7).
• OR tighter: add requireViewports: [Desktop, Mobile] only (no themes) plus a skillFileUrl, and update SKILL.md Phase 7 to match.

PR (JSONbored/gittensory):

• Add requireViewports/requireThemes/skillFileUrl to .gittensory.yml.example's screenshotTableGate example block — it currently only documents enabled/whenLabels/whenPaths/action/message, so self-hosters can't discover matrix mode exists at all.

Expected Outcome

gittensory's screenshot-gate posture is either deliberately documented as presence-mode, or tightened to a matrix that's actually achievable for a dark-mode-only UI — either way, no longer silently undocumented. The public example file discloses matrix mode exists.

Links & Resources

• Evidence: jsonbored__gittensory.gittensory.yml:91-99; jsonbored__metagraphed.gittensory.yml:47-73; src/review/screenshot-table-gate.ts:251-259,343-373; apps/gittensory-ui/src/components/site/theme-toggle.tsx ("dark-mode-only build")

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Part of #5270 (roadmap epic).

[linear-code]

JSO-3767

[JSONbored]

Applied directly to jsonbored__gittensory/.gittensory.yml on the dedicated server, 2026-07-12 (backup: .gittensory.yml.backup-drift-audit-roadmap-5270-20260712T130708Z). Took the minimal option: added a comment above screenshotTableGate explaining it intentionally stays presence-mode (gittensory-ui is dark-mode-only, and the contributor skill documents a flexible viewport policy rather than a fixed matrix — copying metagraphed's matrix verbatim would false-close valid PRs). Left the public-repo .gittensory.yml.example doc gap (requireViewports/requireThemes/skillFileUrl undocumented) for a follow-up PR since it's a separate, non-urgent doc improvement.