fix(control-plane): derive the audit-log root from the registry in the binding and the shell defaults

from_env() fills delegate_job_logs_dir with the delegate_job_logs next to
the resolved mam_jobs_dir unless DELEGATE_JOB_LOGS_DIR is set, so a session
created with only MAM_JOBS_DIR moved no longer records the workspace's old
log root. worktree_prepare.sh passes DELEGATE_JOB_LOGS_DIR on only when the
caller set it. lib.sh and the delegate-job wrapper no longer carry a bash
copy of the default: delegate_publish_cmd, delegate_started_recorded and
_logs_dir_abs resolve it with get_logs_dir(<registry>), the wrapper fails
closed when it cannot, exports the resolved root to its children, prints
it as submit's last line, and logs takes --registry-dir.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.agents/skills/lib_py/control_plane.py

@@ -21,6 +21,8 @@ import shlex
 import sys
 from typing import Dict, Optional
 
+from lib_py.delegation import mqtt_common
+
 KEYS = ("workspace_root", "agent_sessions_yaml", "mam_jobs_dir", "delegate_job_logs_dir")
 ENV = {"workspace_root": "WORKSPACE_ROOT", "agent_sessions_yaml": "AGENT_SESSIONS_YAML",
        "mam_jobs_dir": "MAM_JOBS_DIR", "delegate_job_logs_dir": "DELEGATE_JOB_LOGS_DIR"}
@@ -45,6 +47,10 @@ def from_env(env=None) -> Dict[str, str]:
         v = (env.get(var) or "").strip()
         if v:
             b[k] = _abs(v)
+    # Issue #57: without an explicit DELEGATE_JOB_LOGS_DIR the audit log is
+    # the delegate_job_logs next to the registry in use, not the workspace's.
+    if not (env.get("DELEGATE_JOB_LOGS_DIR") or "").strip():
+        b["delegate_job_logs_dir"] = _abs(mqtt_common.sibling_logs_dir(b["mam_jobs_dir"]))
     return b