Add the UI-free core — device discovery, keycode catalog, layout geometry - #84
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HaoboGu merged 2 commits intoAug 3, 2026
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`DeviceDescriptor` restated five of `DeviceInfo`'s six fields, and every transport filled one on connect: serial re-ran `available_ports()` to look up the VID/PID it had just opened, and BLE read three Device Information Service characteristics over the air. Nothing ever read the result — the store asks the device itself once the handshake completes, and gets the firmware version with it. So the connect commands now answer with the session id alone, and `ConnectResponse` goes with the struct. `TransportInfo` gains a stable id per transport (port path / BLE id / socket address) so a rescan can tell which entry is the live one, and `discover()` no longer closes every session just to enumerate — that teardown belongs to startup, where a reloaded frontend's stale session is what needs dropping. `closeAllSessions` is exported for the caller that will do it.
None of this draws anything — it is what a keymap UI has to have underneath. - `deviceStore` holds discovery: scan, connect, switch, disconnect, and the startup pass that drops sessions a reloaded frontend left holding the port. - `keycatalog` answers "what can this key be bound to" from the firmware's own table, which `keycodeTables()` reads out of the wasm client. Families are matched by name rather than listed, so a keycode added upstream lands in its group by itself and anything unclaimed still reaches the user through `Other`. Against the current firmware that surfaced 48 codes the hand-written lists had missed, `Undo`/`Cut`/`Copy`/`Paste` among them. - `layout` turns a decoded variant into an extent: a key counts by its turned outline, so a 1u key at 45° is √2 wide and sizing from `rect.w` would clip it. A firmware that ships no `[layout].map` gets the bare matrix from its capabilities, built as a real `Variant` so nothing downstream branches on it. - `keycode` names actions the way a keymap reads them, `matrix` decodes the pressed bitmap, and the store gains `refreshMatrix` so a live view can poll the one thing topics never push.
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