multi-session sweep: submodule bumps + doc/recipe/script updates

Submodule pointer updates (forks already pushed):
- base: netstack generic ReaderPool + OwnedFd bridge (36dddf23)
- bootloader, installer, userutils: upstream-tracking commits

Parallel agent work swept:
- kf6-kcmutils: recipe + CMakeLists + initial migration patch
- redbear-iwlwifi: Cargo.toml update
- tlc: MC-PARITY-AUDIT + README updates
- xwayland recipe+patch removed (stale)
- scripts: verify-patch-content.py, lint-config-paths.sh
- docs: CONSOLE-TO-KDE-DESKTOP-PLAN, DBUS-INTEGRATION-PLAN,
  HARDWARE-VALIDATION-MATRIX, REDBEAR-FULL-SDDM-BRINGUP,
  UPSTREAM-SYNC-PROCEDURE, README

local/scripts/verify-patch-content.py

@@ -253,7 +253,7 @@ def main():
         return 0
 
     print('  ACTION REQUIRED: orphaned patches must be applied to fork HEAD')
-    print('  See: local/docs/PATCH-PRESERVATION-AUDIT-2026-07-12.md')
+    print('  See: local/docs/legacy-obsolete-2026-07-25/PATCH-PRESERVATION-AUDIT-2026-07-12.md')
     print('  Helper: re-run local/scripts/apply-patches.sh and re-absorb')
     if args.strict:
         return 1