feat(host,clients): PyroWave ships in default builds; NVIDIA hosts advertise it

Flip the `pyrowave` cargo feature into the default set across punktfunk-host,
pf-client-core, pf-presenter and the session client — every packaged build
(flatpak, arch/rpm/copr, windows x64 client) now carries the codec. Selection
stays strictly per-session opt-in: a client must pick "PyroWave (wired LAN)"
in Settings (or PUNKTFUNK_PREFER_PYROWAVE=1); nothing changes for normal
HEVC/AV1 sessions. The Windows ARM64 client leg builds --no-default-features
and keeps skipping it (decode is Linux-native + Apple Metal today).

Advertisement no longer waits for the PUNKTFUNK_ENCODER=pyrowave lab
override on NVIDIA: host_wire_caps sets the bit whenever the feature is
present and the host isn't the GPU-less software pref, and
SessionPlan::output_format flips a PyroWave session on the NVIDIA-auto
capture path to CPU RGB frames (the EGL→CUDA import only NVENC consumes;
the wavelet backend ingests raw dmabufs or CPU RGB). AMD/Intel keep their
raw-dmabuf zero-copy unchanged; per-session raw-dmabuf passthrough on
NVIDIA (true zero-copy without the env's global capture policy) stays a
follow-up.

On-glass on .21 (RTX 5070 Ti, default-features binaries, NO env overrides):
host advertises + negotiates PyroWave, the CPU-capture fallback engages,
60 fps at e2e 3.2-5.7 ms p50, and a mid-stream 1080p→720p resize rides on
top cleanly. Workspace clippy --locked clean; 33 client + 314 host tests.

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

clients/session/Cargo.toml

@@ -13,9 +13,11 @@ name = "punktfunk-session"
 path = "src/main.rs"
 
 [features]
-default = ["ui"]
-# PyroWave client decode (the opt-in wired-LAN wavelet codec) — enables the decode
-# backend + the planar present path; runtime opt-in stays PUNKTFUNK_PREFER_PYROWAVE=1.
+default = ["ui", "pyrowave"]
+# PyroWave client decode (the wired-LAN wavelet codec) — enables the decode backend + the
+# planar present path. ON by default; each session still opts in explicitly (the Settings
+# codec pick, or PUNKTFUNK_PREFER_PYROWAVE=1). The Windows ARM64 leg builds
+# --no-default-features and so skips it (video decode is Linux-only anyway).
 pyrowave = ["pf-client-core/pyrowave", "pf-presenter/pyrowave"]
 # The Skia console UI (stats OSD, capture HUD, later the gamepad library). Dropping it
 # (`--no-default-features`) is the ~15 MB-smaller power-user build: same streaming,