[MainSequenceDev]

Summary

Animated agent icons move only where they help (ADR 090 amended 2026-10-16, following the platform's ADR-033 amendment in Main-Sequence-Server-Side/tdag-django#1005).

• AgentIcon gains motion ("still" by default). An animated color icon shows frame 0 in lists, the launcher, thread avatars and the application's agent pages. It animates only with motion="animate", which three places pass: the rail header badge, the connecting stage, and the avatar of the agent that is working.
• Reduced motion (useCommandCenterViewport().reducedMotion) always shows frame 0. An animated avatar no longer also runs the ms-chat-pulse animation.
• The still comes from the same bytes. The icon cache drops the APNG acTL/fcTL/fdAT chunks once per icon and keeps a static PNG of frame 0 (src/engine/apng-still.ts). There is no second request, canvas or decode, and the still's object URL is revoked with the icon's.
• Pixel art stays sharp. The parser reads the optional commandCenterIcon.imageRendering (absent means auto; pixelated only for color), and a pixelated color icon is drawn with image-rendering: pixelated.

Compatibility: additive npm API (AgentIcon.motion, optional CommandCenterAgentIcon.imageRendering); useAgentIconObjectUrl keeps its signature. There is one new stylesheet rule and skill content text. No storage key, skill name or path, installer behavior, SDK peer range or route changes. A static icon renders as before.

Release: this PR adds to ## Unreleased and has no version bump, so merging does not publish. Command Center picks it up after a chore(release): prepare command-center-ai 0.0.14 (which also ships the unreleased rail resizing) and a bump in Main-Sequence-Server-Side/CommandCenter.

Test plan

• Node 22, command-center-ai: npm run check exit 0; npm test 54 files / 403 tests passed, plus node --test 15 passed; npm run build exit 0.
• Repo root npm run check exit 0.
• The test fixtures are the platform sanitizer's own APNG and PNG output. Stripping the chunks from a backend APNG yields a single-frame PNG whose pixels are frame 0 (checked with Pillow).
• CI on this PR.
• In Command Center after the release and bump: a pixel-art agent is still in the explorer and animates in the rail header.

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