feat!: mux-py on DongLoRa Protocol v2 with tag-aware dispatch

The 1.0 Python mux, mirroring the Rust donglora-mux 1.0 one-for-one and implementing the full §13 multi-client semantics on the DongLoRa Protocol v2 wire format.

* Structural rewrite. donglora_mux/{daemon,intercept,session,tagmap}.py replace the 601-line __init__.py monolith.

* Tag-aware dispatch. TagMapper with skip-zero allocation and per-client bulk drop on disconnect. Multiple clients can have commands in flight concurrently; the single-oneshot response slot is gone.

* Full §13.2 multi-client SET_CONFIG semantics. Tracks (client_id, modulation) lock owner and synthesizes OK(APPLIED/MINE), OK(ALREADY_MATCHED/OTHER), or OK(LOCKED_MISMATCH/OTHER).

* TX loopback fan-out (§13.4). On TX_DONE(TRANSMITTED) the mux synthesizes an RX frame with origin = LOCAL_LOOPBACK for every connected client except the transmitter.

* Async ERR(EFRAME) fan-out: tag-0 framing errors are broadcast to all clients.

* Per-client TX cache on ClientSession so the loopback fan-out does not need the sender to re-buffer.

* Socket and serial fcntl.flock to prevent multiple mux instances from fighting over the same dongle or socket path.

* 500 ms keepalive matching PROTOCOL.md §3.4 (2x margin on the 1 s inactivity timer), replacing the 5 s cadence from 0.x.

* Clean SIGINT / SIGTERM shutdown: per-client handler tasks are tracked and cancelled, so blocked reader.read() calls no longer pin the event loop open.

uv.lock

@@ -2,6 +2,15 @@ version = 1
 revision = 3
 requires-python = ">=3.10"
 
+[[package]]
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+version = "1.2.0"
+source = { registry = "https://pypi.org/simple" }
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+]
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 name = "cobs"
 version = "1.2.2"
@@ -173,31 +182,27 @@ dev = [
 
 [[package]]
 name = "donglora-mux"
-version = "0.2.0"
+version = "1.0.0"
 source = { editable = "." }
 dependencies = [
-    { name = "cobs" },
     { name = "donglora" },
-    { name = "pyserial" },
 ]
 
 [package.dev-dependencies]
 dev = [
     { name = "pytest" },
+    { name = "pytest-asyncio" },
     { name = "pytest-cov" },
     { name = "ruff" },
 ]
 
 [package.metadata]
-requires-dist = [
-    { name = "cobs" },
-    { name = "donglora", editable = "../client-py" },
-    { name = "pyserial" },
-]
+requires-dist = [{ name = "donglora", editable = "../client-py" }]
 
 [package.metadata.requires-dev]
 dev = [
     { name = "pytest" },
+    { name = "pytest-asyncio" },
     { name = "pytest-cov" },
     { name = "ruff" },
 ]
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 ]
 
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+version = "1.3.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "backports-asyncio-runner", marker = "python_full_version < '3.11'" },
+    { name = "pytest" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
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 name = "pytest-cov"
 version = "7.1.0"