feat(antigravity): update placemat for Antigravity CLI v1.2.12

[dommango]

What this changes

Syncs the Antigravity CLI placemat to v1.2.12 (released 2026-09-27), and fixes the
sync pipeline itself, which was pointed at a changelog URL/markup the vendor has
since replaced.

Content (v1.2.12):

• GEMINI_API_KEY (card-env) — noted the fast-fail on exhausted quota/spend cap/credits
• /artifact (card-slash-tools) — noted the coalesced-scroll-event perf fix
• CLI_GRAPHICS=kitty (card-env) — promoted to verified (reconfirmed in the 1.2.12
  release notes) and noted the multiplexer terminal-title-corruption fix
• editorMode (card-settings) — noted the Vim mode multibyte-navigation/undo fixes
• verbosity (card-settings) — noted the conversation-replay lag fix

Pipeline fix: antigravity.google/changelog now meta-refresh redirects (not an
HTTP 3xx, so curl -L doesn't follow it) to a rebuilt Astro/Starlight page at
/docs/changelog, whose hidden CLI tab panel moved from data-list-panel="cli" to
id="panel-cli" with <article id="rel-cli-X.Y.Z"> rows. Updated sources.json and
PIPELINE.md to target the new URL and markup, and logged the fix in changelog.html
under Template/Structure, same pattern as the prior hidden-panel fix.

Type

• Content correction (wrong/outdated/missing entry)
• Style guide or structural change (pipeline docs)
• Bug fix (broken layout, link, behavior)
• Design / CSS / accessibility
• New agent placemat
• Docs (README / AGENTS.md / CONTRIBUTING)
• CI / tooling

Checklist

• I read AGENTS.md's Style Guide and Content Rules
• node tests/placemat.test.js antigravity passes locally (54 passed, 0 failed)
• node scripts/build-changes.js --all --check passes locally (generated files are fresh)
• No versions/*.html files were edited
• No hand-edited changes.json or feed.xml — both regenerated via scripts/build-changes.js
• Every new/changed row is sourced from the vendor's own changelog (link below) —
  not copied or inferred from a sibling placemat
• CLI_GRAPHICS=kitty was unverified from an earlier release note mention; this
  release note reconfirms it directly, so the class was removed per the promotion rule
• No new rows were added (all edits are notes on existing id="i-..." rows), so no
  new permalinks needed and sources.json → inventory was left untouched
• Only the antigravity/ directory is touched

Source

https://antigravity.google/docs/changelog — CLI panel, <article id="rel-cli-1.2.12">
(release notes: "Smooth full-screen scrolling, fast quota exhaustion handling, and
replay and terminal fixes", dated September 27, 2026)

🤖 Generated with Claude Code

https://claude.ai/code/session_01UHnurs8xJNAYc7YWHt4q6L

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Generated by Claude Code

[dommango]

Merge-gate code review (Step 10)

First pass (medium effort, scoped to antigravity/, against origin/main): structural tests 54/54 passed and the generator staleness check passed. Found 2 content-accuracy issues, neither CRITICAL/HIGH but both worth fixing before merge:

1. The promoted CLI_GRAPHICS=kitty row (now verified) still carried a note saying it was unconfirmed — self-contradictory.
2. sources.json's version_poll.format said the old changelog URL "now 302s" while the same sentence said it was "not an HTTP redirect" — self-contradictory wording.

Fix pass: both reworded in 4a51b5f — the CLI_GRAPHICS=kitty notes now explain the promotion is based on two independent changelog mentions (1.2.10 naming it, 1.2.12 reconfirming it), and sources.json now says the old URL "serves a client-side <meta http-equiv=\"refresh\"> stub ... (not an HTTP 3xx — curl -L will not follow it)", consistent with PIPELINE.md's phrasing.

Re-review: both fixes verified correct, no new or remaining issues. Verdict: clean — 0 findings.

Proceeding to merge per PIPELINE.md Step 10.

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