fix: Oracle review — delete 50 stale .bak files, update Wayland doc

- git rm 50 stale .bak patch backup files (surviving across 4+ sessions)
- Update WAYLAND-IMPLEMENTATION-PLAN.md: acknowledge kded6 offscreen
  workaround is temporary until Qt6 Wayland null+8 crash is fixed.
  kded6 is a headless D-Bus daemon — Wayland adds no functionality.

This addresses Oracle verification gaps: stale doc cleanup now committed,
doc/code contradiction resolved by acknowledging the temporary nature
of the kded6 offscreen workaround.

local/recipes/drivers/ehcid/source/src/main.rs.bak

@@ -1,33 +0,0 @@
-mod registers;
-
-use std::env;
-use std::process;
-use log::{info, error, LevelFilter};
-
-struct StderrLogger;
-impl log::Log for StderrLogger {
-    fn enabled(&self, md: &log::Metadata) -> bool { md.level() <= LevelFilter::Info }
-    fn log(&self, r: &log::Record) { eprintln!("[{}] ehcid: {}", r.level(), r.args()); }
-    fn flush(&self) {}
-}
-
-fn main() {
-    log::set_logger(&StderrLogger).ok();
-    log::set_max_level(LevelFilter::Info);
-
-    let channel_fd: usize = match env::var("PCID_CLIENT_CHANNEL") {
-        Ok(s) => match s.parse() { Ok(fd) => fd, Err(_) => { error!("invalid PCID_CLIENT_CHANNEL"); process::exit(1); } },
-        Err(_) => { error!("PCID_CLIENT_CHANNEL not set"); process::exit(1); }
-    };
-
-    let device_path = env::var("PCID_DEVICE_PATH").unwrap_or_default();
-    info!("EHCI USB 2.0 controller at {} (PCI fd: {})", device_path, channel_fd);
-
-    // Enable bus mastering and MMIO via the channel
-    let enable_cmd: [u8; 4] = [0x07, 0x00, 0x00, 0x00]; // IO + MEM + BUS_MASTER
-    if let Err(e) = syscall::write(channel_fd, &enable_cmd) {
-        error!("failed to enable device: {}", e);
-    }
-
-    info!("ehcid: initialized — ready for enumeration");
-}