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>

hermes_state.py

@@ -832,7 +832,18 @@ class SessionDB:
         params = []
 
         if not include_children:
-            where_clauses.append("s.parent_session_id IS NULL")
+            # Show root sessions and branch sessions (whose parent ended with
+            # end_reason='branched' before the child was created), while still
+            # hiding sub-agent runs and compression continuations (which also
+            # carry a parent_session_id but were spawned while the parent was
+            # still live — i.e., started_at < parent.ended_at).
+            where_clauses.append(
+                "(s.parent_session_id IS NULL"
+                " OR EXISTS (SELECT 1 FROM sessions p"
+                "            WHERE p.id = s.parent_session_id"
+                "            AND p.end_reason = 'branched'"
+                "            AND s.started_at >= p.ended_at))"
+            )
 
         if source:
             where_clauses.append("s.source = ?")