fix(agent-hooks): deliver hook events that fire while Orca is restarting (STA-5329) (#16685)

* fix(agent-hooks): correct durable spool delivery

* fix(agent-hooks): spool curl failures after retries

* fix(agent-hooks): keep replay out of runtime observations

* test(agent-hooks): pin managed hooks inert outside an Orca terminal

* fix(agent-hooks): address review findings on the durable spool

- claude: pass the literal source; options.agent does not exist (typecheck)
- kimi: the windows-local ordering runs its guard pre-stdin and before the
  function exists, so it no longer spools there (printed command-not-found)
- writer: require a readable endpoint file before creating a spool tree
- antigravity: carry its out-of-band event name into the record and filter on it
- drain: truncate only the bytes consumed, preserving concurrent appends and a
  torn trailing line

* fix(agent-hooks): ignore spool events without pane attribution

* fix(agent-hooks): make spool replay and appends robust

* test(agent-hooks): type spool replay records

* fix(agent-hooks): defer unterminated spool records

* fix(agent-hooks): replay spool events through relays

* fix(agent-hooks): preserve Codex prompt across child replay

* fix(relay): keep startup alive when spool replay fails

* fix(relay): simplify spool replay startup guard

src/main/command-code/command-code-managed-script.ts

@@ -1,6 +1,7 @@
 import { buildWindowsAgentHookPostCommand } from '../agent-hooks/installer-utils'
 import {
   buildPosixHookPayloadCapture,
+  buildPosixHookSpoolLines,
   buildWindowsHookEnvironmentGuardLines,
   buildWindowsHookStdinDrainEpilogue
 } from '../agent-hooks/hook-stdin-contract'
@@ -36,6 +37,7 @@ export function buildCommandCodeManagedScript(
   return [
     '#!/bin/sh',
     ...buildPosixHookPayloadCapture(),
+    ...buildPosixHookSpoolLines('command-code'),
     '__orca_read_ancestor_var() {',
     '  __orca_name="$1"',
     '  __orca_pid="${PPID:-}"',
@@ -119,6 +121,7 @@ export function buildCommandCodeManagedScript(
     '  done',
     'fi',
     'if [ -z "$ORCA_AGENT_HOOK_PORT" ] || [ -z "$ORCA_AGENT_HOOK_TOKEN" ] || [ -z "$ORCA_PANE_KEY" ]; then',
+    '  spool_hook_event',
     '  exit 0',
     'fi',
     // Timeout caps best-effort hook posts if the local listener stalls.
@@ -135,7 +138,7 @@ export function buildCommandCodeManagedScript(
     '  --data-urlencode "worktreeId=${ORCA_WORKTREE_ID}" \\',
     '  --data-urlencode "env=${ORCA_AGENT_HOOK_ENV}" \\',
     '  --data-urlencode "version=${ORCA_AGENT_HOOK_VERSION}" \\',
-    '  --data-urlencode "payload@-" >/dev/null 2>&1 || true',
+    '  --data-urlencode "payload@-" >/dev/null 2>&1 || spool_hook_event',
     'exit 0',
     ''
   ].join('\n')