Implement the 20-track POSIX + P2P roadmap: booter, protocol, coreutils, docs,

and seeder/kernel parity.

Booter / ctx (1.44.0)
- bareOsReadPearRuntimeSnapshotJson; hrpc stock routes documented (kernel.*,
  vfs.readText, bare_os.echo, bare_os.disk_os_hints).
- Peer admission: BARE_OS_DHT_ADDRESS_CLASS_ALLOWLIST + meta.dhtAddressClass;
  shouldAttemptPeer(peerKey, meta).
- Optional BARE_OS_VFS_WARM_CACHE_INVALIDATE_ON_APPEND on system drive cores.
- maybeMergeBareFromDrive: path dedupe + early exit when manifest keys satisfied.
- identity-account: zero UTF-8 passphrase buffer after PBKDF2 (string path).

Shell / utilities
- BARE_OS_SHELL_ERREXIT and set -e / set +e; tests in bare-os-booter/test.js.
- expand: comma-separated POSIX-style tab stops; man page + coreutils tests.

Tooling / docs
- kernel-microbench vfs: warmReplicationPathClassify sketch.
- holepunch-drift-repos suggestedCriticalRepos; sync-holepunch-clones report.
- scripts/README: pretest maintainer runbook; handbook/12 P2P vs POSIX.
- KERNEL_CONTRACT, environment appendix, PLACEHOLDER_BASELINE (multisig gate),
  compatibility matrix, posix artifacts, syscalls.example.json, seeder sync.

Requires: npm run pretest && npm test (already green in session).

kernel/etc/bare-os/syscalls.example.json

@@ -1,9 +1,9 @@
 {
-  "schemaVersion": 7,
-  "ctxApiVersion": "1.42.0",
+  "schemaVersion": 8,
+  "ctxApiVersion": "1.44.0",
   "posixProfile": {
     "id": "bare-os-posix-like",
-    "version": "1.0.8"
+    "version": "1.0.9"
   },
   "ops": ["readFile", "writeFile", "socket"],
   "opsDetail": [
@@ -28,34 +28,26 @@
   ],
   "posixXsh": {
     "schema": 2,
-    "note": "POSIX.1 XSH-style names; socket bridge may implement SOCK_DGRAM recv/recvfrom when BARE_OS_POSIX_SOCKET_FD_BRIDGE.",
-    "namesCsv": "open,close,read,write,readv,writev,getsockopt,setsockopt,lseek,pipe,dup,dup2,fcntl,poll,select,umask,socket,bind,listen,accept,connect,send,recv,recvfrom,shutdown"
+    "note": "POSIX.1 XSH-style names; socket bridge may implement SOCK_DGRAM sendmsg/recvmsg when BARE_OS_POSIX_SOCKET_FD_BRIDGE.",
+    "namesCsv": "open,close,read,write,readv,writev,getsockopt,setsockopt,lseek,pipe,dup,dup2,fcntl,poll,select,umask,socket,bind,listen,accept,connect,send,recv,recvfrom,sendmsg,recvmsg,shutdown"
   },
   "socketMsgSurface": {
-    "schema": 1,
-    "sendmsg": { "defaultErrno": "ENOTSUP" },
-    "recvmsg": { "defaultErrno": "ENOTSUP" }
+    "schema": 2,
+    "sendmsg": { "bridgePartial": true, "defaultErrno": "ENOTSUP" },
+    "recvmsg": { "bridgePartial": true, "defaultErrno": "ENOTSUP" }
   },
   "errnoHints": {
     "ENOENT": 2,
-    "EACCES": 13,
-    "ENOSYS": 38
+    "EAGAIN": 11
   },
   "fdModel": {
     "schema": 1,
-    "note": "Integer FDs index logical VFS/IPC targets in the guest.",
     "stdio": [0, 1, 2],
-    "register": "ctx.bareOsRegisterLogicalFd",
-    "processTablePath": "/proc/bare_os/process_table.json",
     "processTableSchema": 7
   },
   "signalModel": {
     "schema": 1,
-    "note": "ctx.bareOsSendSignal delivers to synthetic pids.",
-    "names": ["HUP", "INT", "KILL", "TERM"]
-  },
-  "caps": {
-    "note": "example"
+    "names": ["INT", "TERM"]
   },
   "atMs": 0
 }