v1.3.0 — Niimbot M2-H + automatic model identification

Adds the Niimbot M2-H and makes the driver identify the connected printer automatically. Validated on real hardware (B1, B1 Pro, M2-H).

Added

• Niimbot M2-H (b1 task, 300 dpi, model id 4608) — validated end-to-end. Uses the b1 command sequence with fast unacked writes (B1-Pro-class).
• Automatic model identification — on connect the driver reads the model id (PrinterInfo 0x40[08]) + protocol version (PrinterStatusData 0xA5) and picks the right task/flow-control, even though B1/B1 Pro/M2-H share a BLE name. Exposed as Niimbot.printer; Niimbot.identify(model) returns it without printing; Niimbot.disconnect() swaps printers.
• Per-model flow control — only the 203 dpi B1 paces its writes; the 300 dpi B1 Pro and M2-H burst.
• Live demo on GitHub Pages, package.json (zero-dep, npm-ready), README badges + supported-printer table.

Fixed

• M2-H printed at ~30 s/page because it exposes the write property and fell into slow write-with-response; the b1 path now always prefers fast/paced unacked writes (niim.blue's approach).

Validated printers

Model	task	dpi	id
Niimbot B1	b1	203	4096
Niimbot B1 Pro	v4	300	4097
Niimbot M2-H	b1	300	4608

The only residual slowness is a full random-noise page at 300 dpi (BLE throughput limit) — not a real-label scenario. See docs/protocol-v4.md.

🤖 Generated with Claude Code