feat: P0-P6 kernel scheduler + relibc threading comprehensive implementation

P0-P2: Barrier SMP, sigmask/pthread_kill races, robust mutexes, RT scheduling, POSIX sched API
P3: PerCpuSched struct, per-CPU wiring, work stealing, load balancing, initial placement
P4: 64-shard futex table, REQUEUE, PI futexes (LOCK_PI/UNLOCK_PI/TRYLOCK_PI), robust futexes, vruntime tracking, min-vruntime SCHED_OTHER selection
P5: setpriority/getpriority, pthread_setaffinity_np, pthread_setname_np, pthread_setschedparam (Redox)
P6: Cache-affine scheduling (last_cpu + vruntime bonus), NUMA topology kernel hints + numad userspace daemon

Stability fixes: make_consistent stores 0 (dead TID fix), cond.rs error propagation, SPIN_COUNT adaptive spinning, Sys::open &str fix, PI futex CAS race, proc.rs lock ordering, barrier destroy

Patches: 33 kernel + 58 relibc patches, all tracked in recipes
Docs: KERNEL-SCHEDULER-MULTITHREAD-IMPROVEMENT-PLAN.md updated, SCHEDULER-REVIEW-FINAL.md created
Architecture: NUMA topology parsing stays userspace (numad daemon), kernel stores lightweight NumaTopology hints

config/redbear-full.toml

@@ -24,10 +24,16 @@ shell = "/usr/bin/ion"
 shell = "/usr/bin/zsh"
 
 [packages]
+# Runtime driver parameter control surface.
+driver-params = {}
+
 # Firmware loading
 redbear-firmware = {}
 firmware-loader = {}
 
+# NUMA topology discovery (userspace daemon)
+numad = {}
+
 # GPU/graphics stack
 redox-drm = {}
 mesa = {}
@@ -400,3 +406,4 @@ subclass = 0x00
 command = ["redox-drm"]
 """
 konsole = {}
+kf6-pty = {}