feat(host): PyroWave capture advertises the Vulkan device's dmabuf modifiers

The pyrowave passthrough rode VAAPI's LINEAR-only modifier policy, which
starves it on Mutter+NVIDIA (tiled-only allocations → the compositor
declines the offer → CPU capture fallback). The encoder imports through
VK_EXT_image_drm_format_modifier, not libva, so the capture now extends
the advertisement with every single-memory-plane modifier the PyroWave
device samples from (probed via DrmFormatModifierPropertiesListEXT with
the same device selection as the encoder).

Live on .21 (Mutter+NVIDIA, RTX 5070 Ti): 7 modifiers advertised, the
compositor negotiated block-linear (216172782120099861), no CPU
downgrade, and the encoder's per-buffer import cache populated exactly
as designed (8 PipeWire pool buffers imported once, silent reuse after).
Zero-copy session numbers: static 60 fps, e2e 2.9-3.0 ms p50 (p95 3.4),
host stage 1.6 ms; full-window motion 60 fps at ~80 Mb/s all-intra,
decode ~1 ms. Also neutralizes the VAAPI-specific wording in the
passthrough hand-off log.

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

crates/punktfunk-host/src/capture/linux/mod.rs

@@ -998,7 +998,7 @@ mod pipewire {
                                     h,
                                     modifier = ud.modifier,
                                     fourcc = format_args!("{:#010x}", fourcc),
-                                    "zero-copy: handing dmabuf to VAAPI (GPU import + CSC)"
+                                    "zero-copy: handing the raw dmabuf to the encoder (GPU import + CSC)"
                                 );
                             }
                             return;
@@ -1328,6 +1328,23 @@ mod pipewire {
         if (importer.is_some() || vaapi_passthrough) && !modifiers.contains(&0) {
             modifiers.push(0); // DRM_FORMAT_MOD_LINEAR
         }
+        // PyroWave passthrough: the encoder imports through Vulkan, not libva — extend the
+        // advertisement with every modifier its device samples from, so compositors that
+        // never allocate LINEAR (Mutter+NVIDIA) still negotiate zero-copy dmabufs.
+        #[cfg(feature = "pyrowave")]
+        if vaapi_passthrough && crate::config::config().encoder_pref.as_str() == "pyrowave" {
+            for m in crate::encode::pyrowave_capture_modifiers(
+                crate::zerocopy::drm_fourcc(PixelFormat::Bgrx).unwrap(),
+            ) {
+                if !modifiers.contains(&m) {
+                    modifiers.push(m);
+                }
+            }
+            tracing::info!(
+                count = modifiers.len(),
+                "zero-copy: advertising the PyroWave device's Vulkan-importable dmabuf modifiers"
+            );
+        }
         let want_dmabuf =
             (importer.is_some() || vaapi_passthrough) && !modifiers.is_empty() && !force_shm;
         if force_shm {