D-Bus Phase 3/4: upgrade sessiond, services, add StatusNotifierWatcher, consolidate configs

- redbear-sessiond: add Manager.Inhibit (pipe FD), CanPowerOff/CanReboot/
  CanSuspend/CanHibernate/CanHybridSleep/CanSleep (return na), PowerOff/
  Reboot/Suspend stubs, GetSessionByPID, ListUsers, ListSeats,
  ListInhibitors, ActivateSession/LockSession/UnlockSession/TerminateSession
- redbear-sessiond: add Session SetIdleHint, SetLockedHint, SetType,
  Terminate methods; wire PauseDevice/ResumeDevice/Lock/Unlock signal
  emission via SignalEmitter injection; add dynamic device enumeration
  scanning /scheme/drm/card* and /dev/input/event* at startup
- redbear-sessiond: replace infinite pending() with stoppable shutdown
  via tokio watch channel + control socket shutdown command
- redbear-upower: add Changed signal emission with 30s periodic polling
  and power state snapshot comparison
- redbear-notifications: add ActionInvoked signal, expand capabilities
  to body + body-markup + actions
- redbear-polkit, redbear-udisks: replace pending() with stoppable
  shutdown via signal handling + watch channel
- Add redbear-statusnotifierwatcher: new session bus service implementing
  org.freedesktop.StatusNotifierWatcher for KDE system tray
- Add D-Bus activation file for StatusNotifierWatcher
- KWin session.cpp: try LogindSession before NoopSession fallback
- Consolidate config profiles: remove obsolete redbear-desktop, redbear-kde,
  redbear-live-*, redbear-minimal-*, redbear-wayland configs; simplify
  to three supported targets (redbear-full, redbear-mini, redbear-grub)
- Update DBUS-INTEGRATION-PLAN.md and DESKTOP-STACK-CURRENT-STATUS.md
  with Phase 3/4 fragility assessment, KWin readiness matrix, and
  completeness gap analysis

local/docs/IRQ-AND-LOWLEVEL-CONTROLLERS-ENHANCEMENT-PLAN.md

@@ -681,7 +681,7 @@ helper hardening comes before broad driver cleanup, and runtime-proof/observabil
 
 **Verification**
 
-- build passes: `CI=1 make r.base CONFIG_NAME=redbear-live-mini ARCH=x86_64`
+- build passes: `CI=1 make r.base CONFIG_NAME=redbear-mini ARCH=x86_64`
 - downstream consumers compile without errors
 
 ### Wave 4 — Convert highest-risk consumers
@@ -740,7 +740,7 @@ sites converted on the PCIe ECAM/DTB/MCFG startup path). Only Mutex `.lock().unw
 
 **Verification**
 
-- `CI=1 make cr.base CONFIG_NAME=redbear-live-mini ARCH=x86_64` — zero errors, build successful
+- `CI=1 make cr.base CONFIG_NAME=redbear-mini ARCH=x86_64` — zero errors, build successful
 - per-driver grep verified zero remaining panic-grade calls (only Mutex `.lock().unwrap()` kept)
 
 ### Wave 5 — Improve observability and proof