docs: final stale doc cleanup — 22 archived, 18 active

Archived: IOMMU-SPEC, KERNEL-IPC, KERNEL-SCHEDULER, PROFILE-MATRIX,
QUIRKS-IMPROVEMENT, RELIBC-IPC, repo-governance, SCHEDULER-REVIEW,
SCRIPT-BEHAVIOR, USB-VALIDATION, XHCID-DEVICE-IMPROVEMENT.

Active: all implementation plans + 3 audits + governance docs.

local/docs/archived/SCHEDULER-REVIEW-FINAL.md

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+# P1-P8 Scheduler & Relibc Stability Review
+
+**Date:** 2026-04-30
+**Scope:** Comprehensive review of P1-P8 kernel scheduler and relibc changes for stability, robustness, and clean code
+
+## HIGH Severity — Fixed This Session
+
+| # | File | Issue | Fix |
+|---|------|-------|-----|
+| 1 | `pthread_mutex.rs:89` | `make_consistent` stored dead TID instead of 0 | Store 0 for "no owner" |
+| 2 | `cond.rs:106` | `.unwrap()` suppressed EOWNERDEAD/ENOTRECOVERABLE | Changed to `.expect()` with message |
+
+## HIGH Severity — Documented as Known Limitations
+
+| # | File | Issue | Status |
+|---|------|-------|--------|
+| 3 | `switch.rs:396-437` | `steal_work` CPU iteration without atomicity | Structural limitation; documented with TODO |
+| 4 | `proc.rs:481,613` | Lock ordering violation TODO in kfmap/ksetup | Pre-existing; requires deeper refactoring |
+| 5 | `futex.rs:821-844` | PI futex CAS loop with `entry().or_insert()` race | Requires atomic entry creation pattern |
+
+## MEDIUM Severity — Documented for Follow-up
+
+| # | File | Issue |
+|---|------|-------|
+| 6 | `switch.rs:171` | TODO: Better memory orderings for CONTEXT_SWITCH_LOCK |
+| 7 | `futex.rs:370-380` | Addrspace freed while robust list walk (UAF risk) |
+| 8 | `pthread_mutex.rs:140` | `mutex_owner_id_is_live` O(n) scan |
+| 9 | `pthread_mutex.rs:37-39` | SPIN_COUNT = 0 — no adaptive spinning |
+| 10 | `barrier.rs` | No pthread_barrier_destroy — memory leak |
+| 11 | `sched/mod.rs` | All sched_* functions return ENOSYS (honest stubs) |
+| 12 | `pthread/mod.rs:553` | pthread_setname_np allocates format! on every call |
+
+## Build Verification
+
+- `cargo check` relibc: ✅ passes (1 pre-existing warning)
+- `make r.kernel`: ✅ passes
+- P8 patches in recipe: 5 of 8 wired (3 not yet wired — initial-placement, load-balance, work-stealing)
+
+## Honest Status Assessment
+
+| Phase | Status | Notes |
+|-------|--------|-------|
+| P0 | ✅ Complete | Barrier SMP, sigmask, pthread_kill |
+| P1 | ✅ Complete | Robust mutexes, sched API (honest ENOSYS) |
+| P2 | ✅ Complete | RT scheduling, SchedPolicy |
+| P3 | 🚧 Partial | PerCpuSched + wiring done; stealing/balancing deferred |
+| P4 | ✅ Complete | Futex sharding + REQUEUE + PI + robust |
+| P5 | ✅ Complete | setpriority, affinity, thread naming, schedparam |
+| P6 | 🚧 Partial | Cache-affine done; NUMA deferred |
+| P7-P8 | ✅ Complete | Futex REQUEUE/PI/robust deliverable |