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/test_hermes_state.py

@@ -1485,6 +1485,48 @@ class TestListSessionsRich:
         assert "\n" not in sessions[0]["preview"]
         assert "Line one Line two" in sessions[0]["preview"]
 
+    def test_branch_session_visible_in_list(self, db):
+        """Branch sessions (parent ended with 'branched') must appear in list_sessions_rich."""
+        db.create_session("parent", "cli")
+        db.end_session("parent", "branched")
+        db.create_session("branch", "cli", parent_session_id="parent")
+        db.append_message("branch", "user", "Exploring the alternative approach")
+
+        sessions = db.list_sessions_rich()
+        ids = [s["id"] for s in sessions]
+        assert "branch" in ids, "Branch session should be visible in default list"
+
+    def test_subagent_session_still_hidden(self, db):
+        """Sub-agent children (parent NOT ended with 'branched') remain hidden."""
+        db.create_session("root", "cli")
+        db.create_session("delegate", "cli", parent_session_id="root")
+
+        sessions = db.list_sessions_rich()
+        ids = [s["id"] for s in sessions]
+        assert "delegate" not in ids, "Delegate sub-agent should not appear in default list"
+        assert "root" in ids
+
+    def test_compression_child_still_hidden(self, db):
+        """Compression continuation sessions remain hidden (parent ended with 'compression')."""
+        import time as _time
+        t0 = _time.time()
+        db.create_session("root", "cli")
+        db._conn.execute("UPDATE sessions SET started_at=? WHERE id=?", (t0, "root"))
+        db._conn.execute(
+            "UPDATE sessions SET ended_at=?, end_reason='compression' WHERE id=?",
+            (t0 + 1800, "root"),
+        )
+        db._conn.commit()
+        db.create_session("continuation", "cli", parent_session_id="root")
+        db._conn.execute(
+            "UPDATE sessions SET started_at=? WHERE id=?", (t0 + 1801, "continuation")
+        )
+        db._conn.commit()
+
+        sessions = db.list_sessions_rich(project_compression_tips=False)
+        ids = [s["id"] for s in sessions]
+        assert "continuation" not in ids, "Compression continuation should stay hidden"
+
 
 class TestCompressionChainProjection:
     """Tests for lineage-aware list_sessions_rich — compressed conversations