fix(lib): resolve workspace CWD mismatch in herdr new-session shim and enforce target workspace slug priority

.agents/skills/lib.sh

@@ -265,13 +265,20 @@ print('\t'.join(env_flags) + '\n' + ' '.join(binary_tokens))
     fi
 
     # Check if there is an existing workspace inside this session (to reuse and split view)
-    existing_ws=$(_real_herdr workspace list 2>/dev/null | python3 -c "
-import sys, json
+    existing_ws=$(_real_herdr workspace list 2>/dev/null | TARGET_CWD="${ws:-.}" python3 -c "
+import sys, json, os
+target_ws = os.environ.get('TARGET_CWD', '')
 try:
+    target_abs = os.path.realpath(target_ws) if target_ws else ''
     d = json.loads(sys.stdin.read())
     wss = d.get('result', {}).get('workspaces', [])
-    if wss:
-        print(wss[0].get('workspace_id', ''))
+    matched_id = ''
+    for w in wss:
+        w_cwd = os.path.realpath(w.get('cwd', '')) if w.get('cwd') else ''
+        if target_abs and w_cwd == target_abs:
+            matched_id = w.get('workspace_id', '')
+            break
+    print(matched_id)
 except Exception:
     pass
 ")
@@ -745,24 +752,20 @@ for s in d.get('herdr_sessions', []):
     if s.get('name') == name:
         print(s.get('herdr_session') or s.get('herdr_server') or s.get('herdr_workspace') or 'default')
         sys.exit(0)
-fallback = os.environ.get('HERDR_SESSION_NAME', '')
-if not fallback or fallback == 'default':
-    legacy = os.environ.get('HERDR_SERVER_NAME', '')
-    if legacy and legacy != 'default':
-        fallback = legacy
-if not fallback or fallback == 'default':
-    if ws:
-        # derive_workspace_slug Equivalent in python
-        abs_ws = os.path.abspath(ws)
-        parent = os.path.basename(os.path.dirname(abs_ws)) or 'workspace'
-        work = os.path.basename(abs_ws) or 'root'
-        if parent in ('/', '.'): parent = 'workspace'
-        if work in ('/', '.'): work = 'root'
-        slug = f'{parent}-{work}'.lower().replace('_', '-')
-        import re
-        slug = re.sub(r'[^a-zA-Z0-9-]', '', slug).lstrip('-')
-        fallback = f'mam-{slug}' if slug else 'mam-ws'
-    else:
+fallback = ''
+if ws:
+    abs_ws = os.path.abspath(ws)
+    parent = os.path.basename(os.path.dirname(abs_ws)) or 'workspace'
+    work = os.path.basename(abs_ws) or 'root'
+    if parent in ('/', '.'): parent = 'workspace'
+    if work in ('/', '.'): work = 'root'
+    slug = f'{parent}-{work}'.lower().replace('_', '-')
+    import re
+    slug = re.sub(r'[^a-zA-Z0-9-]', '', slug).lstrip('-')
+    fallback = f'mam-{slug}' if slug else 'mam-ws'
+else:
+    fallback = os.environ.get('HERDR_SESSION_NAME', '') or os.environ.get('HERDR_SERVER_NAME', '')
+    if not fallback or fallback == 'default':
         fallback = 'default'
         print('WARN: resolve_herdr_session called without workspace parameter for unregistered session; falling back to default', file=sys.stderr)
 print(fallback or 'default')