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/punktfunk-host/src/inject/linux/steam_controller2.rs

@@ -178,8 +178,8 @@ impl TritonPad {
                     let reply = triton_feature_reply(&self.last_set, &self.serial, self.unit_id);
                     if reply[1] != self.last_get_logged {
                         self.last_get_logged = reply[1];
-                        tracing::info!(
-                            cmd = format!("{:#04x}", reply[1]),
+                        tracing::debug!(
+                            cmd = %format_args!("{:#04x}", reply[1]),
                             "virtual SC2: answering feature GET"
                         );
                     }