fix(mobile): wire plugin catalog and session-scoped subagent controls

tui_gateway/mobile_subagents.py

@@ -0,0 +1,55 @@
+"""Read-only mobile subagent views, scoped to the invoking live session."""
+import time
+from pathlib import Path
+
+
+def owned_records(session_id, transport, session, *, include_lineage=False):
+    from tools.delegate_tool import _active_subagents, _active_subagents_lock, _owns_subagent_record
+    if transport is None or session is None:
+        return []
+    with _active_subagents_lock:
+        records = [dict(row) for row in _active_subagents.values()]
+    return [row for row in records
+            if (row.get("owner_session_id") == session_id
+                and row.get("owner_transport") is transport
+                and row.get("owner_session_record") is session)
+            or (include_lineage and _owns_subagent_record(row, session.get("agent")))]
+
+
+def roster(records):
+    fields = ("subagent_id", "parent_id", "depth", "goal", "delegation_id", "model",
+              "started_at", "status", "tool_count", "last_tool", "accepting_steer")
+    rows = []
+    for record in records:
+        row = {key: record[key] for key in fields if key in record}
+        started = record.get("started_at")
+        if isinstance(started, (int, float)):
+            row["elapsed_seconds"] = max(0, time.time() - started)
+        rows.append(row)
+    return {"subagents": rows, "delegations": []}
+
+
+def transcript_tail(records, subagent_id):
+    result = {"subagent_id": subagent_id, "available": False, "text": "", "bytes_read": 0, "truncated": False}
+    record = next((r for r in records if r.get("subagent_id") == subagent_id), None)
+    if record is None:
+        return result
+    path = getattr(record.get("agent"), "_live_transcript_path", None)
+    if not isinstance(path, (str, Path)):
+        return result
+    try:
+        # Only the registry's own file is read; no client-supplied path is accepted.
+        from tools.delegation_live_log import live_transcript_root
+        path = Path(path)
+        root = live_transcript_root().resolve()
+        if path.is_symlink() or not path.resolve().is_relative_to(root):
+            return result
+        with path.open("rb") as stream:
+            size = stream.seek(0, 2)
+            stream.seek(max(0, size - 16384))
+            raw = stream.read(16384)
+        result.update(available=True, text=raw.decode("utf-8", errors="replace"),
+                      bytes_read=len(raw), truncated=size > len(raw))
+    except OSError:
+        pass  # A just-completed child's temporary transcript may already be gone.
+    return result