Add official emulator support and gallery package

[kylewhirl]

Adds first-class support for the official BUSY Bar Emulator while leaving the hardware protobuf WebSocket path unchanged.

Includes:

• automatic emulator SSE input detection
• repeatable end-to-end emulator test
• 72x16 visual capture from the emulator
• gallery-compatible launcher and manifest
• v0.2.0 packaging support for the pinned GitHub launcher

Validation:

• npm test (16/16)
• npm run check
• npm run build
• npm run test:emulator
• Playwright visual and interaction pass
• priority-steal and forced-disconnect recovery

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 0893064c88

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[chatgpt-codex-connector]

Pin the launcher to an existing revision

When a user starts the new gallery entry, npx must resolve the hard-coded #v0.2.0 Git ref before it can install or run the package, but the reviewed repository contains no v0.2.0 tag (or any tags). Unless that tag is created separately, every gallery launch fails during package resolution; publish the tag or pin this launcher to a revision that already exists.

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