fix(update): the monitor is this workspace's exact command line; create/resume take the pane workspace's admission; refusal snapshots compare the registry by rows (Issue #72, review round 3)

- daemon.find_running matches `<bash> <reconcile.sh> --subscribe[ ...]`
  exactly instead of an unanchored, unescaped pgrep regex: another
  workspace's daemon (ws.a vs wsXa) or a process naming the path in an
  argument is no longer signalled by the update. update.sh re-checks which
  PIDs are still the monitor before SIGKILL.
- create and resume (spawn path) take the update admission of every
  installed workspace at or above the pane cwd, not only the control
  root's (lib.sh mam_update_admit_at, lib_py.update target-workspaces --cwd);
  the ~/.local/bin wrapper child drops all of them.
- tests: snapshot() skips the SQLite -wal/-shm and compares the DB by its
  rows (macOS keeps the sidecars and a read rewrites -shm); regression tests
  for the monitor match and for create/resume in another installed
  workspace (marker and lock wait); evidence line refs shifted.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/multi-agent-mux-create/scripts/create_session.sh

@@ -260,7 +260,7 @@ spawn() {
         SESSION_UUID=""
         CMD_FULL="$("$(_delegate_py_bin)" -m lib_py.agents spawn-spec "$AGENT" "$RESOLVED_BIN" "" "true" 2>/dev/null || echo "${RESOLVED_BIN} --dangerously-skip-permissions")"
         [ -z "$CP_PREFIX" ] || echo "WARNING: the ~/.local/bin wrapper path bypasses herdr; the control-plane binding is recorded but not forwarded" >&2
-        nohup "$WRAPPER" >/dev/null 2>&1 7>&- &
+        ( mam_update_admit_release_all; exec nohup "$WRAPPER" >/dev/null 2>&1 ) &
         disown
       else
         HERDR_SESSION_NAME="$HERDR_SESSION_NAME" _herdr new-session -d -s "$SESSION_NAME" -x 140 -y 40 -c "$WORKSPACE" "$CP_PREFIX$CMD_FULL"
@@ -285,9 +285,10 @@ if [ "$DRY_RUN" = "1" ]; then
 fi
 # Issue #63: a same-cwd session of this post-discovered agent records its id first (lib.sh mam_id_order_wait).
 mam_id_order_wait "$WORKSPACE" "$AGENT" "$SESSION_NAME" || exit 1
-# Issue #72: no new session while an update runs; held until the row is written
-# (lib.sh mam_update_admit).
-mam_update_admit || exit 1
+# Issue #72: no new session while an update of the control root or of an
+# installed workspace the pane's cwd is in runs; held until the row is written
+# (lib.sh mam_update_admit_at).
+mam_update_admit_at "$WORKSPACE" || exit 1
 HERDR_EPOCH=$(date +%s)
 NOW_ISO=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
 spawn
@@ -641,7 +642,7 @@ snap['cwd'] = os.environ['PANE_CWD']
 print(f"appended: {name}", flush=True)
 PYEOF
 ROW_APPENDED=1
-mam_update_admit_release
+mam_update_admit_release_all
 
 echo
 echo "=== created ==="