feat: kernel roadmap wave — bits4, policy v4, Pear/Bare compatibility

- protocol/booter: bits4 handshake, proc surfaces, boot policy v4, telemetry v4
- coreutils: nohup + ensure-man-pages; seed-man-pages fixes for extra pages
- kernel-runner: no static node:module (Pear); bare-module createRequire
- docs: handbook, reference, ADR, compatibility matrix, verify scripts

kernel/etc/bare-os/boot.policy.example.json

@@ -5,10 +5,13 @@
   "requireSeedCaps": 0,
   "requireFeatureBits2": 0,
   "requireFeatureBits3": 0,
+  "requireFeatureBits4": 0,
   "maxExecLineDepth": 48,
   "denyEnvKeys": ["EXAMPLE_UNWANTED"],
   "requireProcNodes": ["/proc/bare_os/features", "/proc/version"],
   "allowedPearIpcChannels": [],
   "denyVfsPrefixes": [],
+  "denyExecLineBuiltins": [],
+  "allowedCtxMethods": [],
   "maxInitdRestartsPerUnit": 8
 }