fix(host/inject,drivers): rumble root fixes A-C — lossless report ring + rumble-keyed idle watchdogs

B: PadFeedback.game_drove -> rumble_drove, keyed on vibration-asserting reports — an
LED/adaptive-trigger stream can no longer feed the abandoned-rumble force-off while a
coalesced stop never re-asserts (the confirmed unbounded stuck-ON path). C: Linux parity —
every UHID backend now arms the shared watchdog (Steam Input drives these pads over hidraw
with Windows abandonment semantics) and the uinput mixer force-stops abandoned
infinite-replay FF effects (FfState, unit-tested). Shared PUNKTFUNK_RUMBLE_IDLE_MS hatch
(0 = off; non-zero floored above SDL's ~2 s rumble resend).

A: PadShm v2.1 — a 1024 B tail extension carrying an 8-slot lossless output-report ring,
feature-negotiated via zeroed reserved fields (out_ring_ver; deliberately NO
GAMEPAD_PROTO_VERSION bump — mixed generations degrade to the legacy latest-report slot
instead of failing closed). The pf-dualsense driver dual-writes both planes
(publish_output); the host's shared OutputDrain drains oldest->newest with a torn-read
recheck and an overflow->resync path (PadFeedback.resync force-stops + re-arms dedups).
pf-umdf-util grows a min_data_size map fallback. Ds*Feedback.fresh removed (dead).

design/rumble-root-fix.md par. A-C. Verified: pf-inject tests+clippy Linux+Windows (53/53
on winbox incl. the stop-coalesce repro); drivers ws check+clippy on the CI runner.

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

crates/pf-inject/src/inject/linux/dualshock4.rs

@@ -378,7 +378,11 @@ impl PadProto for Ds4LinuxProto {
                 .map(|(r, g, b)| HidOutput::Led { pad: idx, r, g, b })
                 .into_iter()
                 .collect(),
-            game_drove: None,
+            // Rumble-plane liveness (arms the shared abandoned-rumble force-off) — see the Linux
+            // DualSense backend for the hidraw-writer rationale; `parse_ds4_output` gates rumble
+            // on flag0 bit0 the same way.
+            rumble_drove: Some(fb.rumble.is_some()),
+            resync: false,
         }
     }
 }