fix(fmt) + feat(gamepad): CI-matching rustfmt everywhere, enforced by repo git hooks; N4 spike flips to GO via MI_02

Three things that belong together:

1. rustfmt the gamepad-new-types host files ci.yml's `cargo fmt --all
   --check` gate flags (the .21/.133 verify recipes ran clippy+tests
   but never fmt — the same class of miss as 69f30f30).

2. Enforce it at the source: scripts/git-hooks/{pre-commit,pre-push}
   run the exact CI fmt gates (main workspace + the shipped-driver
   crates of the UMDF workspace); CONTRIBUTING documents the one-time
   `git config core.hooksPath scripts/git-hooks`. pre-push is the
   enforcement point (plumbing commits bypass pre-commit).

3. N4 follow-up — the spike verdict FLIPS TO GO: SwDeviceProfile grows
   `usb_mi`, synthesizing `&MI_02` into the Deck spike's USB hardware
   ids. hidclass mirrors the parent's USB tokens into the HID child's
   hardware ids, and hidapi/SDL/Steam parse `MI_` as bInterfaceNumber
   (defaulting to 0 when absent — the exact gate the first run hit:
   Steam wants the Deck controller on interface 2). Re-run live on
   .173: Steam logs `Interface: 2`, then `!! Steam controller device
   opened`, `Steam Controller reserving XInput slot 0`, and activates
   a mapping — full Steam Input promotion of the software-devnode
   Deck, no driver change needed. The PS identities pass
   `usb_mi: None` (real single-interface devices carry no MI_ token).
   A proper Windows-Deck backend phase is now justified; planned
   separately.

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

crates/punktfunk-host/src/inject/linux/dualsense.rs

@@ -13,10 +13,9 @@
 //! UMDF-driver backend; this module is just the `/dev/uhid` plumbing around it.
 
 use super::dualsense_proto::{
-    edge_paddle_bits, parse_ds_output, serialize_state, DsFeedback, DsState,
-    DS_EDGE_PRODUCT, DS_FEATURE_CALIBRATION, DS_FEATURE_FIRMWARE, DS_FEATURE_PAIRING,
-    DS_INPUT_REPORT_LEN, DS_PRODUCT, DS_TOUCH_H, DS_TOUCH_W, DS_VENDOR, DUALSENSE_EDGE_RDESC,
-    DUALSENSE_RDESC,
+    edge_paddle_bits, parse_ds_output, serialize_state, DsFeedback, DsState, DS_EDGE_PRODUCT,
+    DS_FEATURE_CALIBRATION, DS_FEATURE_FIRMWARE, DS_FEATURE_PAIRING, DS_INPUT_REPORT_LEN,
+    DS_PRODUCT, DS_TOUCH_H, DS_TOUCH_W, DS_VENDOR, DUALSENSE_EDGE_RDESC, DUALSENSE_RDESC,
 };
 use crate::inject::uhid_manager::{PadFeedback, PadProto, UhidManager};
 use anyhow::{Context, Result};
@@ -102,7 +101,8 @@ impl DualSensePad {
                 format!("open {UHID_PATH} (is the 60-punktfunk.rules uhid rule installed + are you in 'input'?)")
             })?;
         let mut ds = DualSensePad { fd, seq: 0, ts: 0 };
-        ds.send_create2(index, id).context("UHID_CREATE2 DualSense")?;
+        ds.send_create2(index, id)
+            .context("UHID_CREATE2 DualSense")?;
         Ok(ds)
     }