feat(realtime): lucy-2.5 + optional sampleFrameData on set/setImage

[tomershlasky]

Summary

• Adds the lucy-2.5 realtime model (shared/model.ts, exposed via models.realtime("lucy-2.5") and the registry).
• Adds optional sampleFrameData (Blob | File | base64 string | null) to realtime.set() and realtime.setImage(), serialized as a new sample_frame_data field on the existing set_image WS message. Field is only emitted when the caller passes it — no behavior change for existing callers.
• Adds a "capture & attach camera reference frame" toggle plus the lucy-2.5 option in the playground (packages/sdk/index.html).

Merge with main / LiveKit re-home

Main shipped the LiveKit migration (#122/#138) and observability orchestrator (#132) since this branch last picked up main. The legacy webrtc-connection.ts / webrtc-manager.ts modules are gone, so the original wiring was re-homed onto the new transport:

• signaling-channel.ts#setImage now writes sample_frame_data on the outgoing set_image WS frame when provided.
• stream-session.ts#setImage forwards via the existing ImageSetOptions plumbing.
• realtime/client.ts#setImage accepts the public sampleFrameData (Blob/File/string/null) and converts to base64 at the boundary.
• realtime/methods.ts#set does the same conversion at the helper boundary.
• Public type lives on ImageSetOptions in realtime/types.ts; wire field on SetImageMessage.

Test cleanup: dropped the old WebRTCConnection/WebRTCManager-specific tests that no longer apply; added focused sampleFrameData coverage on mockSession.setImage in tests/realtime.unit.test.ts.

Test plan

• pnpm -F @decartai/sdk build clean
• pnpm -F @decartai/sdk lint and format:check clean
• pnpm -F @decartai/sdk test — 210/210 pass (5 test files), incl. new sampleFrameData wire coverage
• Live playground smoke test against /v1/stream: connect with lucy-2.5, toggle reference-frame checkbox, confirm sample_frame_data appears on the outgoing set_image WS frame in DevTools (and is absent when the checkbox is off)

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@decartai/sdk@135

commit: 0b62195