fix(pf-vdisplay/driver): report cursor_excluded adapter-wide — the declare's exclusion is not per-target

Field report (iPad via GameStream, 2026-07-23): cursor missing from the
stream. The session's fresh target 257 reported cursor_excluded=false
(DECLARED_TARGETS is keyed per target and only 259 had declared), so the
host skipped forced-composite — but DWM's pointer exclusion after an
IddCx hardware-cursor declare reaches EVERY later monitor of the adapter,
not just the declaring target (proven on-glass: declare on 259 under
WUDFHost 2192, then 257's frames streamed pointer-free with CURSOR_SHOWING
set and SM_MOUSEPRESENT true). GameStream/Moonlight clients cannot draw a
forwarded cursor, so those sessions were silently cursor-less.

ADD replies now report any-declare-this-WUDFHost-life (the state's real
scope — it dies with the adapter reset, same as before); per-target ids
stay only as the dbglog audit trail. Channel-less sessions on a declared
adapter then hit the existing forced-composite gate (GDI poller + blend)
and carry the pointer in-video. Host code unchanged.

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

crates/pf-frame/src/dxgi.rs

@@ -32,10 +32,12 @@ pub struct WinCaptureTarget {
     /// duplicates the sealed frame channel's handles INTO (`idd_push::ChannelBroker`). `0` = unknown
     /// (a pre-v2 pairing can't occur — the version handshake is hard — so this only guards misuse).
     pub wudf_pid: u32,
-    /// The ADD reply flagged this target as carrying an IRREVOCABLE IddCx hardware-cursor declare
-    /// from an earlier session (remote-desktop-sweep §8.6): DWM excludes the pointer from its
-    /// frames forever, so a session WITHOUT the cursor channel must self-composite (the IDD-push
-    /// capturer's forced-composite gate) or the streamed desktop has no cursor at all.
+    /// The ADD reply flagged the ADAPTER as carrying an IRREVOCABLE IddCx hardware-cursor declare
+    /// from an earlier session (remote-desktop-sweep §8.6; reach is adapter-wide, not per-target —
+    /// on-glass 2026-07-23, a GameStream session's fresh target streamed cursor-less): DWM
+    /// excludes the pointer from its frames until adapter reset, so a session WITHOUT the cursor
+    /// channel must self-composite (the IDD-push capturer's forced-composite gate) or the
+    /// streamed desktop has no cursor at all.
     pub cursor_excluded: bool,
 }