feat(gamepad): DualSense Edge backend — Linux UHID + Windows UMDF (N1)

The plain-DualSense transport + report codec under the Edge USB identity
(054C:0DF2, verbatim 389-byte real-device descriptor cross-checked against
the raw usbmon capture + hhd's production virtual Edge), so the wire back
grips (BTN_PADDLE1..4: Deck L4/L5/R4/R5, Elite P1-P4) land on the Edge's
NATIVE buttons[2] bits instead of the fold/drop policy: PADDLE1/2 -> the
right/left back buttons, PADDLE3/4 -> the right/left Fn buttons (kernel
BTN_TRIGGER_HAPPY1..4 on >= 7.2; SDL/Steam read hidraw on any kernel).

- proto: Edge descriptor + btn2 bits + edge_paddle_bits(), pinned against
  hid-playstation DS_EDGE_BUTTONS_* and SDL_hidapi_ps5 (tests).
- Linux: DsUhidIdentity parameterizes the UHID create; DsEdgeLinuxProto /
  DualSenseEdgeManager. Headless-validated on .21 (7.1): driver=playstation
  binds 0DF2, all 4 input devices created, probe lightbar/player-LED
  feedback round-trips; dualsense-test grew --edge (cycles all 4 paddles).
- Windows: UMDF driver serves device_type=2 (Edge descriptor/attrs/strings,
  DS feature blobs); WinDsIdentity parameterizes the SwDevice profile +
  devtype stamp; DsEdgeWinProto / DualSenseEdgeWindowsManager; INF gains
  pf_dualsenseedge. Driver change => resign + reinstall before on-glass.
- Router: DualSenseEdge arms in route_handle/apply_rich/pump/heartbeat;
  pick_gamepad folds Edge -> itself on linux||windows; degrade_if_no_uhid
  covers it.
- Client (SDL): 054C:0DF2 declares DualSenseEdge (no distinct SDL type);
  Edge physical pads take the raw DS5 effects path; console-UI glyphs =
  Shapes. Apple/Android pickers follow separately.

Verified: .21 clippy -D warnings + 292/0 host tests + on-box UHID bind
smoke; .133 clippy pending in this push.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/punktfunk-host/src/main.rs

@@ -255,19 +255,28 @@ fn real_main() -> Result<()> {
         // Create a virtual DualSense via UHID and exercise it (validation, no streaming session):
         // toggles the Cross button, sweeps the left stick, and prints any HID output the kernel
         // sends back. Verify with `evtest` / `ls /dev/input/by-id/*Punktfunk*` / `wpctl status`.
+        // `--edge` creates a DualSense **Edge** (054C:0DF2) instead and additionally cycles the
+        // four back/Fn buttons (kernel ≥ 7.2 exposes them as BTN_TRIGGER_HAPPY1..4; on older
+        // kernels verify the bind + `hidraw` byte 10 instead).
         #[cfg(target_os = "linux")]
         Some("dualsense-test") => {
-            use inject::dualsense::DualSensePad;
-            use inject::dualsense_proto::DsState;
+            use inject::dualsense::{DsUhidIdentity, DualSensePad};
+            use inject::dualsense_proto::{edge_paddle_bits, DsState};
             let secs: u64 = args
                 .iter()
                 .skip_while(|a| *a != "--seconds")
                 .nth(1)
                 .and_then(|s| s.parse().ok())
                 .unwrap_or(20);
+            let edge = args.iter().any(|a| a == "--edge");
+            let (identity, label) = if edge {
+                (DsUhidIdentity::dualsense_edge(), "DualSense Edge")
+            } else {
+                (DsUhidIdentity::dualsense(), "DualSense")
+            };
             use std::time::{Duration, Instant};
-            let mut pad =
-                DualSensePad::open(0).context("create virtual DualSense via /dev/uhid")?;
+            let mut pad = DualSensePad::open(0, &identity)
+                .with_context(|| format!("create virtual {label} via /dev/uhid"))?;
             // Answer the kernel's init GET_REPORTs promptly so hid-playstation creates the input
             // devices before we start streaming state.
             let init = Instant::now() + Duration::from_millis(800);
@@ -276,7 +285,7 @@ fn real_main() -> Result<()> {
                 std::thread::sleep(Duration::from_millis(10));
             }
             println!(
-                "virtual DualSense created — check `evtest`, `ls /dev/input/by-id/*Punktfunk*`, \
+                "virtual {label} created — check `evtest`, `ls /dev/input/by-id/*Punktfunk*`, \
                  `ls /sys/class/leds/`. Cycling Cross + sweeping LS for {secs}s."
             );
             let deadline = Instant::now() + Duration::from_secs(secs);
@@ -292,14 +301,22 @@ fn real_main() -> Result<()> {
                 if last_write.elapsed() >= Duration::from_millis(300) {
                     last_write = Instant::now();
                     i += 1;
-                    let buttons = if i % 2 == 0 {
+                    let mut buttons = if i % 2 == 0 {
                         punktfunk_core::input::gamepad::BTN_A
                     } else {
                         0
                     };
+                    if edge {
+                        // Cycle one paddle per beat (R4 → L4 → R5 → L5) so all four Edge slots
+                        // are visible in evtest / hidraw.
+                        buttons |= punktfunk_core::input::gamepad::BTN_PADDLE1 << (i % 4);
+                    }
                     let lx = (((i % 64) - 32) * 1024) as i16; // sweep left stick X
-                    let st = DsState::from_gamepad(buttons, lx, 0, 0, 0, 0, 0);
-                    pad.write_state(&st).context("write DualSense report")?;
+                    let mut st = DsState::from_gamepad(buttons, lx, 0, 0, 0, 0, 0);
+                    if edge {
+                        st.buttons[2] |= edge_paddle_bits(buttons);
+                    }
+                    pad.write_state(&st).context("write report")?;
                 }
                 std::thread::sleep(Duration::from_millis(15));
             }