fix(/branch): redirect session_log_file and expose branch sessions in list (#14854) (#16150)

* fix(/branch): redirect session_log_file and expose branch sessions in list

Two bugs when using /branch:

1. cli.py _handle_branch_command updated agent.session_id but not
   agent.session_log_file, so all messages written after branching
   landed in the original session's JSON file and the branch never
   got its own session_{id}.json on disk.

   Fix: mirror the compression-split path (run_agent.py:7579) and
   update session_log_file immediately after changing session_id.

2. hermes_state.py list_sessions_rich filtered out every session
   with parent_session_id IS NOT NULL to hide sub-agent runs and
   compression continuations. Branch sessions share this column, so
   they became invisible to `hermes sessions list` and `sessions browse`.

   Fix: also include branch children — those whose parent ended with
   end_reason='branched' AND whose started_at >= parent.ended_at
   (the same timing condition that get_compression_tip uses to
   distinguish continuations from live-spawned subagents).

Fixes #14854

Co-Authored-By: Octopus <liyuan851277048@icloud.com>

* chore(release): map octo-patch placeholder email in AUTHOR_MAP

---------

Co-authored-by: octo-patch <octo-patch@github.com>
Co-authored-by: Octopus <liyuan851277048@icloud.com>

tests/cli/test_branch_command.py

@@ -160,6 +160,30 @@ class TestBranchCommandCLI:
         assert agent.reset_session_state.called
         assert agent._last_flushed_db_idx == 4  # len(conversation_history)
 
+    def test_branch_updates_agent_session_log_file(self, cli_instance, session_db, tmp_path):
+        """Branching must redirect the agent's session_log_file to the new session's path."""
+        from cli import HermesCLI
+        from pathlib import Path
+
+        logs_dir = tmp_path / "sessions"
+        logs_dir.mkdir()
+
+        agent = MagicMock()
+        agent._last_flushed_db_idx = 0
+        agent.logs_dir = logs_dir
+        agent.session_log_file = logs_dir / f"session_{cli_instance.session_id}.json"
+        cli_instance.agent = agent
+
+        old_log_file = agent.session_log_file
+        HermesCLI._handle_branch_command(cli_instance, "/branch")
+
+        new_session_id = cli_instance.session_id
+        expected_log = logs_dir / f"session_{new_session_id}.json"
+        assert agent.session_log_file == expected_log, (
+            "session_log_file must point to the branch session, not the original"
+        )
+        assert agent.session_log_file != old_log_file
+
     def test_branch_sets_resumed_flag(self, cli_instance, session_db):
         """Branch should set _resumed=True to prevent auto-title generation."""
         from cli import HermesCLI