feat!: v0.2.0 — module split, Rust parity, PyPI-ready

Split monolithic __init__.py into six modules matching the Rust client
structure: protocol.py, codec.py, discovery.py, transport.py, connect.py,
client.py. All symbols re-exported from top-level for backwards compat.

New features:
- Ping-on-connect validation (200ms handshake, matches Rust v0.2.0)
- try_connect(), connect_default(), connect_mux_auto(), validate()
- connect() commits to mux when socket exists (no USB fall-through)
- Bandwidth/ErrorCode IntEnums, RadioConfig TypedDict, py.typed marker
- MAX_PAYLOAD, RADIO_CONFIG_SIZE, tag/error constants
- Payload size validation on Transmit
- 46 pytest tests ported from Rust (protocol, codec, client, firmware compat)
- GitHub Actions CI (ruff + pytest on 3.10-3.13 + PyPI publish)
- Strict ruff linting (E, W, F, I, UP, B, C4, ARG, SIM, RUF)

Breaking: package renamed back to donglora (from donglora-python).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -1,15 +1,21 @@
 # DongLoRa Python Client
 
 Python client library for talking to a DongLoRa device — either directly
-over USB or through the [mux daemon](../../mux/).
+over USB or through the [mux daemon](https://github.com/donglora/mux-py).
 
-## What's in Here
+## Install
 
-- `donglora/` — the library: device discovery, COBS framing, protocol
-  encoding/decoding, mux client support
-- Installable as `donglora` via pip/uv
+```
+pip install donglora
+```
 
-## Usage
+Or with [uv](https://docs.astral.sh/uv/):
+
+```
+uv add donglora
+```
+
+## Quick Start
 
 ```python
 import donglora as dl
@@ -17,15 +23,48 @@ import donglora as dl
 ser = dl.connect()
 dl.send(ser, "SetConfig", config=dl.DEFAULT_CONFIG)
 dl.send(ser, "StartRx")
+
 while True:
     pkt = dl.recv(ser)
     if pkt:
         print(pkt["rssi"], pkt["payload"].hex())
 ```
 
+## Connection Functions
+
+| Function | Description |
+|----------|-------------|
+| `connect()` | Auto-detect: TCP mux, Unix socket mux, then USB serial |
+| `connect_default()` | Convenience wrapper with default timeout |
+| `try_connect()` | Like `connect()` but non-blocking — raises if no device found |
+| `connect_mux_auto()` | Mux only — never falls back to USB serial |
+| `mux_connect()` | Connect via Unix domain socket |
+| `mux_tcp_connect()` | Connect via TCP |
+
+## Module Structure
+
+| Module | Contents |
+|--------|----------|
+| `donglora.protocol` | Wire types, RadioConfig, encode/decode, constants |
+| `donglora.codec` | COBS framing |
+| `donglora.discovery` | USB device discovery by VID:PID |
+| `donglora.transport` | MuxConnection (socket wrapper) |
+| `donglora.connect` | Connection auto-detection and mux helpers |
+| `donglora.client` | High-level send/recv/validate |
+
+Everything is re-exported from the top-level `donglora` package.
+
 ## Dependencies
 
 - `cobs` — COBS framing
 - `pyserial` — USB serial communication
 
 Optional extras: `meshcore` (crypto), `orac` (AI bot).
+
+## Development
+
+```
+just check    # fmt + lint + test
+just fmt      # format code
+just test     # run tests
+```