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>

cli.py

@@ -4915,6 +4915,12 @@ class HermesCLI:
         if self.agent:
             self.agent.session_id = new_session_id
             self.agent.session_start = now
+            # Redirect the JSON session log to the new branch session file so
+            # messages written after branching land in the correct file.
+            if hasattr(self.agent, "session_log_file") and hasattr(self.agent, "logs_dir"):
+                self.agent.session_log_file = (
+                    self.agent.logs_dir / f"session_{new_session_id}.json"
+                )
             self.agent.reset_session_state()
             if hasattr(self.agent, "_last_flushed_db_idx"):
                 self.agent._last_flushed_db_idx = len(self.conversation_history)