v0.2.2 — DOM streaming, streamCell overhaul, notebook utilities

What's new in 0.2.2

Added

• streamCell(ref, options?) now accepts { timeoutMs?, heartbeatMs? } — configurable execution timeout (default 180 s) and heartbeat interval (default 30 s)
• DOM fallback in streamCell: when cells.list() returns no output for a running cell (e.g. a 55-minute training loop), the SDK reads live page text via Playwright's shadow-DOM walker and streams it incrementally
• BrowserSession.readPageText() — public shadow-DOM text-node walker
• outputsToText(outputs) — converts a Jupyter outputs array to plain text; exported from package root
• hasErrorOutput(outputs) — returns true if any output has output_type === "error"; exported from package root
• stripOutputs(notebookJson) — strips all cell outputs and execution counts from a notebook JSON string before upload; exported from package root
• StreamCellOptions type exported from package root

Changed

• streamCell no longer yields raw JSON snapshots — yields incremental text OutputChunk objects
• Heartbeat messages are yielded as OutputChunk (type stdout) instead of written directly to process.stdout

Fixed

• WebSocket error events on ColabProxy absorbed via EventEmitter (no more uncaught exceptions on socket errors)