Add fifth feature word (STOCK_V5 / bits5) with ADR and capability docs.

Protocol: canonical seed RPC registry (seed-rpc-methods.js), bits5 on
capabilities, typed seed RPC errors, richer replication_queue and
staging_slot hints.

Booter: /proc host_os (bare-module on Bare, node:os on Node), sync_window,
debug.json, net_summary transport stats, HDMS hints/correlation, warm
profile reload, subprocess bridge snapshot helpers, boot policy v5 hooks,
BARE_OS_BIN_WORKER_ALLOW pattern groups, VFS symlink/union alignment, OTel
JSONL schema version 2 in var-log.

Seeder: pass staging/replication hints into seed channel; mirror kernel
init and boot policy example.

Kernel: enforce requireFeatureBits5 / requireInitJsSha256 when configured;
selftests for new proc surfaces.

CI/pretest: verify-doc-links, verify-man-coverage, verify-compat-matrix;
extend roadmap/ctx/dts verifiers. Add otel-bare-os-jsonl schema.

Docs: Wave 5 roadmap, kernel-extensions, handbook/devguide updates;
bare-module manifest tier/risk sample; bare-libs README.

scripts/verify-ctx-api-feature-bits.mjs

@@ -60,6 +60,10 @@ function main() {
     console.error('index.js should wire seed/features bits4')
     process.exit(1)
   }
+  if (!idx.includes('bits5')) {
+    console.error('index.js should wire seed/features bits5')
+    process.exit(1)
+  }
 
   const bitsSrc = read(bitsPath)
   if (!bitsSrc.includes('export const BARE_OS_KERNEL_FEATURES_STOCK_V1')) {
@@ -86,6 +90,12 @@ function main() {
     )
     process.exit(1)
   }
+  if (!bitsSrc.includes('export const BARE_OS_KERNEL_FEATURES_STOCK_V5')) {
+    console.error(
+      'kernel-feature-bits.js missing BARE_OS_KERNEL_FEATURES_STOCK_V5'
+    )
+    process.exit(1)
+  }
   const docMatch = bitsSrc.match(
     /export const BARE_OS_KERNEL_FEATURE_BITS_DOC = (\d+)/
   )