fix(gateway): route background-process notifications into Telegram DM topics

Background-process completion notifications (notify_on_complete) and
watch-pattern notifications were always delivered to the Telegram main
chat instead of the originating private-chat topic.

Hermes-created Telegram DM topic lanes only render a send when it carries
both message_thread_id and a reply anchor. The synthetic MessageEvent
injected on process completion had no message_id, so _reply_anchor_for_event
returned None and _thread_kwargs_for_send dropped message_thread_id
entirely — routing the notification to the main chat.

Capture the triggering message id at spawn time and thread it through to
the synthetic event so it can be reply-anchored back into the topic:

- session_context: add HERMES_SESSION_MESSAGE_ID context var
- telegram adapter: populate SessionSource.message_id on inbound messages
- terminal tool: persist watcher_message_id on the process session
- process registry: carry/persist message_id on watcher dicts + checkpoint
- gateway: set MessageEvent.message_id on injected notifications

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/process_registry.py

@@ -109,6 +109,7 @@ class ProcessSession:
     watcher_user_id: str = ""
     watcher_user_name: str = ""
     watcher_thread_id: str = ""
+    watcher_message_id: str = ""                # Triggering message id — reply anchor for topic routing
     watcher_interval: int = 0                   # 0 = no watcher configured
     notify_on_complete: bool = False             # Queue agent notification on exit
     # Watch patterns — trigger agent notification when output matches any pattern
@@ -278,6 +279,7 @@ class ProcessRegistry:
                     "user_id": session.watcher_user_id,
                     "user_name": session.watcher_user_name,
                     "thread_id": session.watcher_thread_id,
+                    "message_id": session.watcher_message_id,
                     "message": (
                         f"Watch patterns disabled for process {session.id} — "
                         f"{WATCH_STRIKE_LIMIT} consecutive rate-limit windows triggered "
@@ -310,6 +312,7 @@ class ProcessRegistry:
             "user_id": session.watcher_user_id,
             "user_name": session.watcher_user_name,
             "thread_id": session.watcher_thread_id,
+            "message_id": session.watcher_message_id,
         })
 
     def _global_watch_admit(self, now: float) -> bool:
@@ -1314,6 +1317,7 @@ class ProcessRegistry:
                             "watcher_user_id": s.watcher_user_id,
                             "watcher_user_name": s.watcher_user_name,
                             "watcher_thread_id": s.watcher_thread_id,
+                            "watcher_message_id": s.watcher_message_id,
                             "watcher_interval": s.watcher_interval,
                             "notify_on_complete": s.notify_on_complete,
                             "watch_patterns": s.watch_patterns,
@@ -1377,6 +1381,7 @@ class ProcessRegistry:
                     watcher_user_id=entry.get("watcher_user_id", ""),
                     watcher_user_name=entry.get("watcher_user_name", ""),
                     watcher_thread_id=entry.get("watcher_thread_id", ""),
+                    watcher_message_id=entry.get("watcher_message_id", ""),
                     watcher_interval=entry.get("watcher_interval", 0),
                     notify_on_complete=entry.get("notify_on_complete", False),
                     watch_patterns=entry.get("watch_patterns", []),
@@ -1397,6 +1402,7 @@ class ProcessRegistry:
                         "user_id": session.watcher_user_id,
                         "user_name": session.watcher_user_name,
                         "thread_id": session.watcher_thread_id,
+                        "message_id": session.watcher_message_id,
                         "notify_on_complete": session.notify_on_complete,
                     })
 

tools/terminal_tool.py

@@ -1970,11 +1970,13 @@ def terminal_tool(
                         _gw_thread_id = _gse("HERMES_SESSION_THREAD_ID", "")
                         _gw_user_id = _gse("HERMES_SESSION_USER_ID", "")
                         _gw_user_name = _gse("HERMES_SESSION_USER_NAME", "")
+                        _gw_message_id = _gse("HERMES_SESSION_MESSAGE_ID", "")
                         proc_session.watcher_platform = _gw_platform
                         proc_session.watcher_chat_id = _gw_chat_id
                         proc_session.watcher_user_id = _gw_user_id
                         proc_session.watcher_user_name = _gw_user_name
                         proc_session.watcher_thread_id = _gw_thread_id
+                        proc_session.watcher_message_id = _gw_message_id
 
                 # Mutual exclusion: if both notify_on_complete and watch_patterns
                 # are set, drop watch_patterns. The combination produces duplicate
@@ -2011,6 +2013,7 @@ def terminal_tool(
                             "user_id": proc_session.watcher_user_id,
                             "user_name": proc_session.watcher_user_name,
                             "thread_id": proc_session.watcher_thread_id,
+                            "message_id": proc_session.watcher_message_id,
                             "notify_on_complete": True,
                         })