refactor: drop milestone names + consolidate clients; loss-recovery & rumble fixes

Two bodies of work in one commit (the rename moved files the fixes also touched).

Naming/structure cleanup (pre-launch):
- Host modules m3.rs->punktfunk1.rs, m0.rs->spike.rs; CLI m3-host->punktfunk1-host,
  m0->spike; bare `punktfunk-host` now prints help. Types M3Options/M3Source->
  Punktfunk1Options/Punktfunk1Source.
- Clients consolidated out of crates/ into clients/: punktfunk-client-rs->
  clients/probe (crate punktfunk-probe), client-linux->clients/linux,
  client-windows->clients/windows, punktfunk-android->clients/android/native
  (crate punktfunk-client-android; kept [lib] name=punktfunk_android so the JNI
  contract is unchanged). crates/ now holds only core + host.
- Milestone codes M0-M4 purged from code/CLI/CLAUDE.md/README/docs/docs-site,
  kept only in docs/implementation-plan.md. docs/m2-plan.md->
  docs/gamestream-host-plan.md. CI/gradle/flatpak paths updated.

Client loss-recovery (video froze and never recovered after a brief drop):
- Export punktfunk_connection_frames_dropped through the C ABI (the core already
  tracked it for the client keyframe-recovery loop; it was never reachable from
  the ABI clients). Regenerated punktfunk_core.h.
- Apple (StreamPump + Stage2Pipeline) and Android (decode.rs) now poll
  frames_dropped and request a keyframe when it climbs -- the same loss-driven
  recovery Linux/Windows already had. Under infinite GOP the decoder silently
  conceals reference-missing frames, so the decode-error trigger rarely fires.

Apple rumble robustness (worked then went spotty -- DualSense + Xbox):
- Add CHHapticEngine stopped/reset handlers (rebuild on app background / audio
  interruption / server reset) and drop the permanent `broken` latch on a
  transient drive failure; latch only when the controller truly has no haptics.
- Surface swallowed SDL set_rumble errors on Linux/Windows + diagnostic logging.

Verified: cargo build/clippy/fmt --workspace, C-ABI harness, header drift.
Not runnable on this box (verify in CI): Gitea workflows, gradle/Android,
flatpak, Swift/decky.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/windows/src/gamepad.rs

@@ -0,0 +1,550 @@
+//! App-lifetime gamepad service over SDL3 (mirrors the Swift/GTK clients' `GamepadManager` +
+//! capture/feedback). Ported near-verbatim from the GTK Linux client — SDL3 is cross-platform,
+//! so the only Windows change is the build (`sdl3` is compiled from source via the bundled
+//! CMake, since there is no system SDL3).
+//!
+//! One worker thread owns SDL for the process lifetime: it tracks connected pads, selects the
+//! ONE controller forwarded as pad 0 (user pin, else the most recently connected), and — while
+//! a session is attached — forwards buttons/axes, DualSense touchpad contacts and motion
+//! samples (0xCC), and renders feedback: rumble on every pad, lightbar via SDL, and on a real
+//! DualSense the raw effects packet (adaptive-trigger blocks replayed verbatim, player LEDs).
+//! Held state is zeroed on the wire when the active pad switches or the session detaches, so
+//! nothing sticks down.
+//!
+//! This thread is also the single consumer of the rumble and HID-output pull planes.
+
+use punktfunk_core::client::NativeClient;
+use punktfunk_core::config::GamepadPref;
+use punktfunk_core::input::{gamepad as wire, InputEvent, InputKind};
+use punktfunk_core::quic::{HidOutput, RichInput};
+use std::collections::HashMap;
+use std::sync::mpsc::{Receiver, Sender};
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+
+/// Motion scale constants, shared convention with the other clients (`GamepadWire`): derived
+/// from hid-playstation's math over the host's fixed calibration blob. SDL hands us gyro in
+/// rad/s and accel in m/s²; the DualSense report wants raw LSBs.
+const GYRO_LSB_PER_RAD_S: f32 = 20.0 * 180.0 / std::f32::consts::PI;
+const ACCEL_LSB_PER_G: f32 = 10_000.0;
+const G: f32 = 9.80665;
+
+#[derive(Clone, Debug)]
+pub struct PadInfo {
+    // `id`/`name` feed the settings GUI's pad list (a follow-up); the windowed client only
+    // reads `is_dualsense` (via `auto_pref`), so they're unused in reachable code for now.
+    #[allow(dead_code)]
+    pub id: u32,
+    #[allow(dead_code)]
+    pub name: String,
+    pub is_dualsense: bool,
+}
+
+enum Ctl {
+    Attach(Arc<NativeClient>),
+    Detach,
+    Pin(Option<u32>),
+}
+
+#[derive(Clone)]
+pub struct GamepadService {
+    pads: Arc<Mutex<Vec<PadInfo>>>,
+    active: Arc<Mutex<Option<PadInfo>>>,
+    pinned: Arc<Mutex<Option<u32>>>,
+    // `Arc<Mutex<…>>` (not a bare `Sender`, which is `!Sync`) so the service is `Sync` — the
+    // WinUI app shares it across the UI thread and the session-pump thread (attach/detach).
+    ctl: Arc<Mutex<Sender<Ctl>>>,
+}
+
+impl GamepadService {
+    pub fn start() -> GamepadService {
+        let pads = Arc::new(Mutex::new(Vec::new()));
+        let active = Arc::new(Mutex::new(None));
+        let pinned = Arc::new(Mutex::new(None));
+        let (ctl, ctl_rx) = std::sync::mpsc::channel();
+        let (p, a, pin) = (pads.clone(), active.clone(), pinned.clone());
+        if let Err(e) = std::thread::Builder::new()
+            .name("punktfunk-gamepad".into())
+            .spawn(move || {
+                if let Err(e) = run(&p, &a, &pin, &ctl_rx) {
+                    tracing::warn!(error = %e, "gamepad service ended — pads disabled");
+                }
+            })
+        {
+            tracing::warn!(error = %e, "gamepad service failed to start");
+        }
+        GamepadService {
+            pads,
+            active,
+            pinned,
+            ctl: Arc::new(Mutex::new(ctl)),
+        }
+    }
+
+    #[allow(dead_code)] // consumed by the settings GUI (follow-up)
+    pub fn pads(&self) -> Vec<PadInfo> {
+        self.pads.lock().unwrap().clone()
+    }
+
+    pub fn active(&self) -> Option<PadInfo> {
+        self.active.lock().unwrap().clone()
+    }
+
+    #[allow(dead_code)] // consumed by the settings GUI (follow-up)
+    pub fn pinned(&self) -> Option<u32> {
+        *self.pinned.lock().unwrap()
+    }
+
+    #[allow(dead_code)] // consumed by the settings GUI (follow-up)
+    pub fn set_pinned(&self, id: Option<u32>) {
+        let _ = self.ctl.lock().unwrap().send(Ctl::Pin(id));
+    }
+
+    pub fn attach(&self, connector: Arc<NativeClient>) {
+        let _ = self.ctl.lock().unwrap().send(Ctl::Attach(connector));
+    }
+
+    pub fn detach(&self) {
+        let _ = self.ctl.lock().unwrap().send(Ctl::Detach);
+    }
+
+    /// What "Automatic" resolves to right now — the virtual pad matching the physical one
+    /// (Swift parity); no pad connected leaves the host's own default.
+    pub fn auto_pref(&self) -> GamepadPref {
+        match self.active() {
+            Some(p) if p.is_dualsense => GamepadPref::DualSense,
+            Some(_) => GamepadPref::Xbox360,
+            None => GamepadPref::Auto,
+        }
+    }
+}
+
+fn send(connector: &NativeClient, kind: InputKind, code: u32, x: i32) {
+    let _ = connector.send_input(&InputEvent {
+        kind,
+        _pad: [0; 3],
+        code,
+        x,
+        y: 0,
+        flags: 0, // pad index 0 — single-pad model
+    });
+}
+
+fn button_bit(b: sdl3::gamepad::Button) -> Option<u32> {
+    use sdl3::gamepad::Button;
+    Some(match b {
+        Button::South => wire::BTN_A,
+        Button::East => wire::BTN_B,
+        Button::West => wire::BTN_X,
+        Button::North => wire::BTN_Y,
+        Button::Back => wire::BTN_BACK,
+        Button::Start => wire::BTN_START,
+        Button::Guide => wire::BTN_GUIDE,
+        Button::LeftStick => wire::BTN_LS_CLICK,
+        Button::RightStick => wire::BTN_RS_CLICK,
+        Button::LeftShoulder => wire::BTN_LB,
+        Button::RightShoulder => wire::BTN_RB,
+        Button::DPadUp => wire::BTN_DPAD_UP,
+        Button::DPadDown => wire::BTN_DPAD_DOWN,
+        Button::DPadLeft => wire::BTN_DPAD_LEFT,
+        Button::DPadRight => wire::BTN_DPAD_RIGHT,
+        Button::Touchpad => wire::BTN_TOUCHPAD,
+        _ => return None,
+    })
+}
+
+/// SDL axis → (wire axis id, wire value). SDL sticks are +y = down; the wire (XInput
+/// convention) is +y = up. SDL triggers span 0..32767; the wire wants 0..255.
+fn axis_value(axis: sdl3::gamepad::Axis, v: i16) -> (u32, i32) {
+    use sdl3::gamepad::Axis;
+    match axis {
+        Axis::LeftX => (wire::AXIS_LS_X, v as i32),
+        Axis::LeftY => (wire::AXIS_LS_Y, -(v as i32).max(-32767)),
+        Axis::RightX => (wire::AXIS_RS_X, v as i32),
+        Axis::RightY => (wire::AXIS_RS_Y, -(v as i32).max(-32767)),
+        Axis::TriggerLeft => (wire::AXIS_LT, (v as i32).clamp(0, 32767) >> 7),
+        Axis::TriggerRight => (wire::AXIS_RT, (v as i32).clamp(0, 32767) >> 7),
+    }
+}
+
+/// The DualSense effects packet (SDL `DS5EffectsState_t`, 47 bytes) — the same layout the host
+/// parses off its virtual pad; the wire's 11-byte trigger blocks drop in verbatim. Enable bits
+/// select only the fields each update touches, so rumble (driven separately through SDL) and
+/// untouched fields keep their state.
+#[derive(Default)]
+struct Ds5Feedback;
+
+impl Ds5Feedback {
+    const RIGHT_TRIGGER: usize = 10;
+    const LEFT_TRIGGER: usize = 21;
+    const PAD_LIGHTS: usize = 43;
+    const LED_RGB: usize = 44;
+
+    fn trigger_packet(which: u8, effect: &[u8]) -> [u8; 47] {
+        let mut p = [0u8; 47];
+        let (flag, off) = if which == 1 {
+            (0x04, Self::RIGHT_TRIGGER)
+        } else {
+            (0x08, Self::LEFT_TRIGGER)
+        };
+        p[0] = flag;
+        let n = effect.len().min(11);
+        p[off..off + n].copy_from_slice(&effect[..n]);
+        p
+    }
+
+    fn lightbar_packet(r: u8, g: u8, b: u8) -> [u8; 47] {
+        let mut p = [0u8; 47];
+        p[1] = 0x04; // lightbar enable
+        p[Self::LED_RGB] = r;
+        p[Self::LED_RGB + 1] = g;
+        p[Self::LED_RGB + 2] = b;
+        p
+    }
+
+    fn player_packet(bits: u8) -> [u8; 47] {
+        let mut p = [0u8; 47];
+        p[1] = 0x10; // player-LED enable
+        p[Self::PAD_LIGHTS] = bits & 0x1F;
+        p
+    }
+}
+
+struct Worker {
+    subsystem: sdl3::GamepadSubsystem,
+    opened: HashMap<u32, sdl3::gamepad::Gamepad>,
+    /// Connection order; the most recently connected is the auto selection.
+    order: Vec<u32>,
+    pinned: Option<u32>,
+    attached: Option<Arc<NativeClient>>,
+    /// Wire state of the active pad — zeroed on the wire at switch/detach.
+    last_axis: [i32; 6],
+    held_buttons: Vec<u32>,
+    last_accel: [i16; 3],
+}
+
+impl Worker {
+    fn active_id(&self) -> Option<u32> {
+        self.pinned
+            .filter(|id| self.opened.contains_key(id))
+            .or_else(|| self.order.last().copied())
+    }
+
+    fn pad_info(&self, id: u32) -> Option<PadInfo> {
+        let pad = self.opened.get(&id)?;
+        Some(PadInfo {
+            id,
+            name: pad.name().unwrap_or_else(|| "Controller".into()),
+            is_dualsense: matches!(
+                self.subsystem
+                    .type_for_id(sdl3::sys::joystick::SDL_JoystickID(id)),
+                sdl3::gamepad::GamepadType::PS5
+            ),
+        })
+    }
+
+    /// Zero everything the host believes is held — on pad switch and detach.
+    fn flush_held(&mut self) {
+        if let Some(c) = &self.attached {
+            for b in self.held_buttons.drain(..) {
+                send(c, InputKind::GamepadButton, b, 0);
+            }
+            for (id, v) in self.last_axis.iter_mut().enumerate() {
+                if *v != 0 && *v != i32::MIN {
+                    send(c, InputKind::GamepadAxis, id as u32, 0);
+                }
+                *v = i32::MIN;
+            }
+        } else {
+            self.held_buttons.clear();
+            self.last_axis = [i32::MIN; 6];
+        }
+    }
+
+    /// Sensors stream only while a session wants them (they cost USB/BT bandwidth).
+    fn set_sensors(&mut self, enabled: bool) {
+        let Some(id) = self.active_id() else { return };
+        if let Some(pad) = self.opened.get_mut(&id) {
+            use sdl3::sensor::SensorType;
+            for s in [SensorType::Gyroscope, SensorType::Accelerometer] {
+                if unsafe { pad.has_sensor(s) } {
+                    let _ = pad.sensor_set_enabled(s, enabled);
+                }
+            }
+        }
+    }
+}
+
+#[allow(clippy::too_many_lines)]
+fn run(
+    pads_out: &Mutex<Vec<PadInfo>>,
+    active_out: &Mutex<Option<PadInfo>>,
+    pinned_out: &Mutex<Option<u32>>,
+    ctl: &Receiver<Ctl>,
+) -> Result<(), String> {
+    // Off-main-thread + no video subsystem: keep SDL away from signals, poll pads on its own
+    // thread.
+    sdl3::hint::set("SDL_NO_SIGNAL_HANDLERS", "1");
+    sdl3::hint::set("SDL_JOYSTICK_THREAD", "1");
+    let sdl = sdl3::init().map_err(|e| e.to_string())?;
+    let subsystem = sdl.gamepad().map_err(|e| e.to_string())?;
+    let mut pump = sdl.event_pump().map_err(|e| e.to_string())?;
+
+    let mut w = Worker {
+        subsystem,
+        opened: HashMap::new(),
+        order: Vec::new(),
+        pinned: None,
+        attached: None,
+        last_axis: [i32::MIN; 6],
+        held_buttons: Vec::new(),
+        last_accel: [0; 3],
+    };
+
+    let publish = |w: &Worker| {
+        let mut list: Vec<PadInfo> = w.order.iter().filter_map(|&id| w.pad_info(id)).collect();
+        list.reverse(); // most recent first — the Settings list order
+        *pads_out.lock().unwrap() = list;
+        *active_out.lock().unwrap() = w.active_id().and_then(|id| w.pad_info(id));
+        *pinned_out.lock().unwrap() = w.pinned;
+    };
+
+    loop {
+        // Control plane from the UI thread.
+        loop {
+            match ctl.try_recv() {
+                Ok(Ctl::Attach(c)) => {
+                    w.attached = Some(c);
+                    w.last_axis = [i32::MIN; 6];
+                    w.set_sensors(true);
+                }
+                Ok(Ctl::Detach) => {
+                    w.flush_held();
+                    w.set_sensors(false);
+                    w.attached = None;
+                }
+                Ok(Ctl::Pin(id)) => {
+                    let before = w.active_id();
+                    w.pinned = id;
+                    if w.active_id() != before {
+                        w.flush_held();
+                        if w.attached.is_some() {
+                            w.set_sensors(true);
+                        }
+                    }
+                    publish(&w);
+                }
+                Err(std::sync::mpsc::TryRecvError::Empty) => break,
+                Err(std::sync::mpsc::TryRecvError::Disconnected) => return Ok(()), // app gone
+            }
+        }
+
+        while let Some(event) = pump.poll_event() {
+            use sdl3::event::Event;
+            let active = w.active_id();
+            match event {
+                Event::ControllerDeviceAdded { which, .. } => {
+                    if !w.opened.contains_key(&which) {
+                        match w.subsystem.open(sdl3::sys::joystick::SDL_JoystickID(which)) {
+                            Ok(pad) => {
+                                tracing::info!(
+                                    name = pad.name().unwrap_or_default(),
+                                    "gamepad attached"
+                                );
+                                w.opened.insert(which, pad);
+                                w.order.push(which);
+                                if w.attached.is_some() && w.active_id() == Some(which) {
+                                    w.set_sensors(true);
+                                }
+                                publish(&w);
+                            }
+                            Err(e) => tracing::warn!(error = %e, "gamepad open failed"),
+                        }
+                    }
+                }
+                Event::ControllerDeviceRemoved { which, .. } => {
+                    if w.opened.remove(&which).is_some() {
+                        w.order.retain(|&id| id != which);
+                        if active == Some(which) {
+                            w.flush_held();
+                        }
+                        tracing::info!("gamepad detached");
+                        publish(&w);
+                    }
+                }
+                Event::ControllerButtonDown { which, button, .. }
+                    if active == Some(which) && w.attached.is_some() =>
+                {
+                    if let Some(bit) = button_bit(button) {
+                        w.held_buttons.push(bit);
+                        send(
+                            w.attached.as_ref().unwrap(),
+                            InputKind::GamepadButton,
+                            bit,
+                            1,
+                        );
+                    }
+                }
+                Event::ControllerButtonUp { which, button, .. }
+                    if active == Some(which) && w.attached.is_some() =>
+                {
+                    if let Some(bit) = button_bit(button) {
+                        w.held_buttons.retain(|&b| b != bit);
+                        send(
+                            w.attached.as_ref().unwrap(),
+                            InputKind::GamepadButton,
+                            bit,
+                            0,
+                        );
+                    }
+                }
+                Event::ControllerAxisMotion {
+                    which, axis, value, ..
+                } if active == Some(which) && w.attached.is_some() => {
+                    let (id, v) = axis_value(axis, value);
+                    if w.last_axis[id as usize] != v {
+                        w.last_axis[id as usize] = v;
+                        send(w.attached.as_ref().unwrap(), InputKind::GamepadAxis, id, v);
+                    }
+                }
+                // DualSense touchpad → the rich-input plane, normalized 0..=65535.
+                Event::ControllerTouchpadDown {
+                    which,
+                    finger,
+                    x,
+                    y,
+                    ..
+                }
+                | Event::ControllerTouchpadMotion {
+                    which,
+                    finger,
+                    x,
+                    y,
+                    ..
+                } if active == Some(which) && w.attached.is_some() => {
+                    let _ = w
+                        .attached
+                        .as_ref()
+                        .unwrap()
+                        .send_rich_input(RichInput::Touchpad {
+                            pad: 0,
+                            finger: finger as u8,
+                            active: true,
+                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
+                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
+                        });
+                }
+                Event::ControllerTouchpadUp {
+                    which,
+                    finger,
+                    x,
+                    y,
+                    ..
+                } if active == Some(which) && w.attached.is_some() => {
+                    let _ = w
+                        .attached
+                        .as_ref()
+                        .unwrap()
+                        .send_rich_input(RichInput::Touchpad {
+                            pad: 0,
+                            finger: finger as u8,
+                            active: false,
+                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
+                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
+                        });
+                }
+                // Motion: accel events update the cache; each gyro event ships a sample (the
+                // DualSense reports both at ~250 Hz). Scale convention shared with the other
+                // clients — sign/scale derived, not yet live-verified.
+                Event::ControllerSensorUpdated {
+                    which,
+                    sensor,
+                    data,
+                    ..
+                } if active == Some(which) && w.attached.is_some() => {
+                    use sdl3::sensor::SensorType;
+                    match sensor {
+                        SensorType::Accelerometer => {
+                            for (i, v) in data.iter().enumerate() {
+                                w.last_accel[i] =
+                                    (v / G * ACCEL_LSB_PER_G).clamp(-32768.0, 32767.0) as i16;
+                            }
+                        }
+                        SensorType::Gyroscope => {
+                            let mut gyro = [0i16; 3];
+                            for (i, v) in data.iter().enumerate() {
+                                gyro[i] = (v * GYRO_LSB_PER_RAD_S).clamp(-32768.0, 32767.0) as i16;
+                            }
+                            let _ =
+                                w.attached
+                                    .as_ref()
+                                    .unwrap()
+                                    .send_rich_input(RichInput::Motion {
+                                        pad: 0,
+                                        gyro,
+                                        accel: w.last_accel,
+                                    });
+                        }
+                        _ => {}
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        // Feedback planes (this thread is their single consumer). The host re-sends rumble state
+        // periodically, so a generous duration with refresh-on-update is safe — a dropped stop
+        // heals within ~500 ms.
+        if let Some(connector) = w.attached.clone() {
+            while let Ok((pad, low, high)) = connector.next_rumble(Duration::ZERO) {
+                if pad == 0 {
+                    if let Some(p) = w.active_id().and_then(|id| w.opened.get_mut(&id)) {
+                        // Surface a failed SDL rumble write: a swallowed error here (DualSense not in
+                        // the right HIDAPI mode, etc.) reads exactly like "rumble doesn't work". The
+                        // host logs the send side on 0xCA, so the two together pinpoint host-game vs
+                        // client-render.
+                        if let Err(e) = p.set_rumble(low, high, 5_000) {
+                            tracing::warn!(low, high, error = %e, "rumble: SDL set_rumble failed");
+                        } else {
+                            tracing::debug!(low, high, "rumble: rendered");
+                        }
+                    } else {
+                        tracing::debug!(low, high, "rumble: received but no active pad to render");
+                    }
+                }
+            }
+            while let Ok(hid) = connector.next_hidout(Duration::ZERO) {
+                let Some(id) = w.active_id() else { continue };
+                let is_ds = w.pad_info(id).is_some_and(|p| p.is_dualsense);
+                let Some(pad) = w.opened.get_mut(&id) else {
+                    continue;
+                };
+                match hid {
+                    HidOutput::Led { pad: 0, r, g, b } if is_ds => {
+                        let _ = pad.send_effect(&Ds5Feedback::lightbar_packet(r, g, b));
+                    }
+                    HidOutput::Led { pad: 0, r, g, b } => {
+                        let _ = pad.set_led(r, g, b);
+                    }
+                    HidOutput::PlayerLeds { pad: 0, bits } if is_ds => {
+                        let _ = pad.send_effect(&Ds5Feedback::player_packet(bits));
+                    }
+                    HidOutput::Trigger {
+                        pad: 0,
+                        which,
+                        ref effect,
+                    } if is_ds => {
+                        let _ = pad.send_effect(&Ds5Feedback::trigger_packet(which, effect));
+                    }
+                    _ => {}
+                }
+            }
+        }
+
+        std::thread::sleep(Duration::from_millis(if w.attached.is_some() {
+            2
+        } else {
+            30
+        }));
+    }
+}