Add window rules, real config validation, and a Wayland DRM/udev backend

- srd.rule(): match windows by title/class, apply floating/maximized/
  workspace/geometry/decoration actions on creation (crates/core/src/rules.rs)
- srd.validate_config()/srd.debug.*: real range/format checks and
  status/profiling helpers, replacing the always-true stub
- Wayland titlebar text rendering via fontdue, unit-tested without a
  display (crates/wayland/src/decoration.rs)
- Wayland precise keybinding matching, replacing the "any Super-held key"
  heuristic, sharing the keysym table with X11 (moved to
  crates/core/src/keysyms.rs)
- Wayland DRM/udev backend (crates/wayland/src/udev.rs): runs as the real
  compositor on a bare TTY via libseat/libinput/KMS, software rendering
  via Pixman + dumb buffers (no GBM/EGL required)
- srdwm_platform::detect() fix, found via VM testing: a bare TTY with no
  DISPLAY/WAYLAND_DISPLAY now correctly resolves to Wayland instead of an
  X11 backend that can never work there
- XWayland integration groundwork (crates/wayland/src/xwayland.rs): spawn,
  X11Wm, and full XwmHandler event routing into the same WindowManager/
  Space pipeline as native clients. Windows don't render yet - a real
  glamor-vs-software-renderer conflict in XWayland's own fallback path,
  root-caused via WAYLAND_DEBUG tracing and documented in
  docs/IMPLEMENTATION_STATUS.md rather than worked around blind.

All verified live in an isolated QEMU VM: X11 backend shows two
decorated, correctly-tiled xterms with real title text; the DRM/udev
Wayland backend opens the GPU, initializes input, and scans out a
rendered frame via KMS page-flip.

1 files changed, 4 insertions, 4 deletions

diff --git a/crates/x11/src/lib.rs b/crates/x11/src/lib.rs
index 0faf513..d025efa 100644
--- a/crates/x11/src/lib.rs
+++ b/crates/x11/src/lib.rs
@@ -18,12 +18,12 @@
 //!   millimeters instead of the CRTC's pixel mode; here it reads the CRTC.
 //!
 //! Not implemented (documented rather than faked): XKB-level keymaps (only
-//! a hand-maintained keysym table covering common keys, see `keysyms.rs`),
-//! ICCCM `WM_HINTS`/urgency, and EWMH pager/taskbar hints beyond
+//! a hand-maintained keysym table covering common keys, shared with the
+//! Wayland backend via `srdwm_core::keysyms`), ICCCM `WM_HINTS`/urgency, and
+//! EWMH pager/taskbar hints beyond
 //! `_NET_SUPPORTED`/`_NET_CLIENT_LIST`/`_NET_WM_STATE` maximize.
 
-mod keysyms;
-
+use srdwm_core::keysyms;
 use srdwm_core::{Event, Modifiers, MouseButton, TitlebarHit, Window as CoreWindow, WindowId, TITLEBAR_HEIGHT};
 use srdwm_core::{Monitor, Rect, WindowManager};
 use srdwm_platform::{Platform, PlatformError, PlatformKind, Result as PlatformResult};