fix(host): cover Codec::PyroWave in the Windows NVENC/AMF match arms

The nine non-exhaustive matches windows-host CI tripped on (run 9917) —
all inside encoder objects a PyroWave session can never open (the
open_video dispatch routes PyroWave to its own backend on Linux and
bails on Windows), so the arms are dispatch-guarded unreachable!().
Verified: cargo check -p punktfunk-host --features nvenc,amf-qsv
--release green on the windows-amd64 runner.

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

crates/punktfunk-host/src/encode/windows/amf.rs

@@ -913,6 +913,7 @@ fn codec_props(codec: Codec) -> CodecProps {
             intra_refresh: None,
             ltr: None,
         },
+        Codec::PyroWave => unreachable!("PyroWave never opens the AMF backend"),
     }
 }
 
@@ -1525,6 +1526,7 @@ impl AmfEncoder {
                     )?;
                 }
             }
+            Codec::PyroWave => unreachable!("PyroWave never opens the AMF backend"),
         }
         // Colour signalling, mirroring `open_win_encoder`: BT.709 limited (SDR) or BT.2020 PQ
         // (HDR) — VUI on AVC/HEVC, sequence-header colour config on AV1. Required when HDR — a
@@ -2171,6 +2173,7 @@ impl Encoder for AmfEncoder {
                     // The static KEY_FRAME_ALIGNED header-insertion mode already puts a sequence
                     // header OBU on every key frame; there is no per-surface twin.
                     Codec::Av1 => {}
+                    Codec::PyroWave => unreachable!("PyroWave never opens the AMF backend"),
                 }
             }
             // LTR-RFI per-frame properties (design: the AMD twin of NVENC intra-refresh recovery).

crates/punktfunk-host/src/encode/windows/nvenc.rs

@@ -244,6 +244,7 @@ fn codec_guid(codec: Codec) -> nv::GUID {
         Codec::H264 => nv::NV_ENC_CODEC_H264_GUID,
         Codec::H265 => nv::NV_ENC_CODEC_HEVC_GUID,
         Codec::Av1 => nv::NV_ENC_CODEC_AV1_GUID,
+        Codec::PyroWave => unreachable!("PyroWave never opens the direct-NVENC backend"),
     }
 }
 
@@ -757,6 +758,7 @@ impl NvencD3d11Encoder {
             }
             // H.264 has no tier; the preset default level is already autoselect.
             Codec::H264 => {}
+            Codec::PyroWave => unreachable!("PyroWave never opens the direct-NVENC backend"),
         }
 
         // Chroma + bit depth. Full-chroma 4:4:4 (HEVC Range Extensions) takes precedence and composes
@@ -795,6 +797,7 @@ impl NvencD3d11Encoder {
                     cfg.encodeCodecConfig.hevcConfig.set_pixelBitDepthMinus8(2);
                     // 10 - 8
                 }
+                Codec::PyroWave => unreachable!("PyroWave never opens the direct-NVENC backend"),
                 Codec::Av1 => {
                     cfg.encodeCodecConfig.av1Config.set_pixelBitDepthMinus8(2);
                     // The input rides at its real depth; NVENC upconverts (mirrors the HEVC path).
@@ -864,6 +867,7 @@ impl NvencD3d11Encoder {
                     av1.matrixCoefficients = mat;
                     av1.colorRange = 0; // studio/limited swing
                 }
+                Codec::PyroWave => unreachable!("PyroWave never opens the direct-NVENC backend"),
             }
         }
 
@@ -885,6 +889,7 @@ impl NvencD3d11Encoder {
                 Codec::Av1 => {
                     cfg.encodeCodecConfig.av1Config.maxNumRefFramesInDPB = RFI_DPB;
                 }
+                Codec::PyroWave => unreachable!("PyroWave never opens the direct-NVENC backend"),
             }
         }
         Ok(cfg)
@@ -1456,6 +1461,9 @@ impl Encoder for NvencD3d11Encoder {
                     }
                     // AV1 mastering/CLL ride METADATA OBUs, not SEI — separate follow-up.
                     Codec::Av1 => {}
+                    Codec::PyroWave => {
+                        unreachable!("PyroWave never opens the direct-NVENC backend")
+                    }
                 }
             }
             (api().encode_picture)(self.encoder, &mut pic)