chore: consolidate parallel-session WIP (HOLD — do not push)

Local snapshot of intermingled in-flight work, committed to unblock the encode
refactor (a clean ffmpeg_win.rs for the vbv-dedup follow-on). These hunks span
the same files and can't be cleanly split here; the commit bundles three
distinct workstreams that each belong in their own PR:

  - logging rework (~43 files: level re-tiering, structured fields, `?e`,
    hot-path flood latches)
  - conflicting-host detection (detect.rs + detect/{linux,windows}.rs + wiring
    in main.rs/mgmt.rs/Cargo.toml/docs/packaging)
  - standby-sink DWM-stall attribution (windows/display_events.rs + capture/
    vdisplay wiring)

NOT verified as a combination. NOT to be pushed until the refactor is done and
these are re-verified and reorganized into their proper per-workstream PRs.

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

crates/pf-client-core/src/video_pyrowave.rs

@@ -537,7 +537,8 @@ impl PyroWaveDecoder {
         let fence = device.create_fence(&vk::FenceCreateInfo::default(), None)?;
 
         tracing::info!(
-            mode = %format!("{width}x{height}"),
+            width,
+            height,
             "PyroWave decoder open on the presenter's device (compute iDWT, BT.709 limited)"
         );
         Ok(PyroWaveDecoder {
@@ -602,8 +603,8 @@ impl PyroWaveDecoder {
         });
         self.next = 0;
         tracing::info!(
-            from = %format!("{}x{}", self.width, self.height),
-            to = %format!("{width}x{height}"),
+            from = %format_args!("{}x{}", self.width, self.height),
+            to = %format_args!("{width}x{height}"),
             "PyroWave decoder rebuilt for mid-stream resize"
         );
         self.width = width;