refactor: rename resolve_herdr_workspace to resolve_herdr_session and use herdr_session database field consistently

.agents/skills/lib.sh

@@ -495,9 +495,9 @@ herdr() {
 }
 
 # ---------------------------------------------------------------------------
-# resolve_herdr_server <session_name>
+# resolve_herdr_session <session_name>
 #
-# Query agent-sessions.yaml to find the herdr_server associated with a session.
+# Query agent-sessions.yaml to find the herdr_session associated with a session.
 # Fallback to HERDR_SERVER_NAME or 'default' if not registered or field is missing.
 # Prints the resolved server name on stdout.
 # ---------------------------------------------------------------------------
@@ -541,13 +541,7 @@ print(json.dumps(d, ensure_ascii=False))
 PYEOF
 }
 
-# Despite the name (kept for caller compatibility — resume/stop/update_yaml_resumed
-# all do `HERDR_SERVER_NAME="$(resolve_herdr_workspace "$SESSION_NAME")"`), this
-# returns the isolated herdr *session* name to use for this MAM session row, not
-# a workspace id. Real isolation is `--session <name>` (see `_MAM_SESSION` in the
-# generated wrapper) — a workspace label match provides no actual isolation
-# since agent/pane commands are server-global regardless of workspace.
-resolve_herdr_workspace() {
+resolve_herdr_session() {
   local session_name="$1"
   MAM_STATE_JSON="$(load_state_json)" SESSION_NAME="$session_name" python3 -c "
 import sys, os, json
@@ -555,7 +549,7 @@ name = os.environ['SESSION_NAME']
 d = json.loads(os.environ.get('MAM_STATE_JSON', '{}'))
 for s in d.get('herdr_sessions', []):
     if s.get('name') == name:
-        print(s.get('herdr_workspace') or s.get('herdr_server') or 'default')
+        print(s.get('herdr_session') or s.get('herdr_workspace') or s.get('herdr_server') or 'default')
         sys.exit(0)
 print(os.environ.get('HERDR_SERVER_NAME', 'default'))
 "