Prepare for tinycloud 0.3.13: sites embed v7 playback speeds (docs/prompt parity release)

[kdr]

Summary

Preps the dist repo for tinycloud 0.3.13, tracking sites embed v7 in the private source repo: every <cg-video> shows a playback-speed menu at every player size (default rates 1 1.5 2), authors supply a custom list with the space-separated playbackrates attribute, and page code gets a playbackRate get/set on the JS API (safe before mount; non-positive and non-numeric values ignored).

The speed menu ships in the Cloudglue-served embed script, not the binary — no new verbs, flags, or feature ids (verbs stay 16, features stay 33), and already-published sites pick it up without republishing.

• skills/tinycloud: teach the speed surface where the embed family is documented — reference/verbs.md (new "Playback speed (sites embed v7)" paragraph + attribute/JS API lists), reference/glossary.md video-share entry, SKILL.md quick-notes bullet.
• Version parity: package.json, plugin.json, marketplace.json, tinycloud-skill.json skill_version → 0.3.13. The skill floor stays 0.3.12 (min_version/supported_range/preflight unchanged — no binary-contract change forces a raise).
• CLAUDE.md / README: 0.3.13 release note, CDN-state and example versions, npx pin examples.

Merge gate

Merge only after CDN channels.stable = 0.3.13 (the live-CDN smoke legs assert the pinned tarball set on push to main).

Test plan

• npm test — 42 passed (offline unit + fixture-CDN e2e)
• claude plugin validate .
• shellcheck install.sh scripts/smoke-test.sh skills/tinycloud/scripts/preflight.sh
• CI preflight/manifest sync check inputs unchanged (floor stays 0.3.12)

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Note

Low Risk
Documentation and version-metadata only; no launcher, installer, or skill preflight contract changes.

Overview
Bumps the dist repo to 0.3.13 (package.json, plugin/marketplace metadata, tinycloud-skill.json skill_version) and refreshes README / CLAUDE.md examples and CDN notes. The skill compatibility floor stays 0.3.12 (min_version, required_features, preflight unchanged).

Agent-facing docs now describe sites embed v7 playback speeds for <cg-video>: a speed menu on all player sizes (default 1 1.5 2), the playbackrates attribute, and playbackRate on the JS API — documented in SKILL.md, reference/verbs.md (new paragraph), and reference/glossary.md. CLAUDE.md frames 0.3.13 as docs/prompt parity only (menu lives in Cloudglue’s embed script; no new CLI verbs, flags, or feature ids).

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