Preview HTMX gallery

Implemented and committed the private Preview semantic HTML5 + HTMX 2.0.10 review gallery; this adds six accessible review states while keeping the approved clean-white production direction and making woven texture opt-in and Preview-only.

Scope

• Host: rdmsm4x
• Worktree: /Users/richh/dev/_handoff/codex-out/amagansett-preview-htmx-gallery-20260826
• Branch: codex/preview-htmx-gallery-20260826
• Commit: 21cfe80c10a2cde7e0c4902c9c00c2ac62da9715
• No deployment, credential use, public launch, or canonical worktree mutation.

Files touched

• Preview semantic shell, vanilla controller, CSS, Vite config, six state fragments, and vendored htmx.min.js.
• package.json and package-lock.json for htmx.org 2.0.10.
• Focused Preview e2e contract in tests/e2e/approved-design-contract.spec.ts.
• docs/PREVIEW-HTMX-GALLERY-RECEIPT-20260826.md.

Verification

• npm test: 11 files, 86 tests passed.
• npm run typecheck: passed.
• npm run build:preview: passed.
• npm run check:preview-worker: passed.
• git diff --check: passed.
• Isolated Playwright on http://127.0.0.1:4194/: six HTMX states, keyboard focus, texture toggle, zero console errors, default white canvas, and 390px no-overflow passed.
• Screenshots: /tmp/amagansett-preview-desktop.png, /tmp/amagansett-preview-mobile.png.

Backup and undo

• Approved concept assets remain unchanged and are recoverable from Git history.
• Undo by restoring the pre-commit Preview source in the integration branch; no deployment-side mutation occurred.

Owner actions

• Parent integration owner should cherry-pick 21cfe80c10a2cde7e0c4902c9c00c2ac62da9715 into the authorized integration worktree, rerun full verification, and independently decide whether/when to publish.