fix(cron): avoid delivery origin as sender identity

cron/scheduler.py

@@ -1204,10 +1204,31 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
     # don't clobber each other's targets (os.environ is process-global).
     from gateway.session_context import set_session_vars, clear_session_vars, _VAR_MAP
 
+    # Cron execution is an internal scheduler context, not a live inbound
+    # gateway message. Do not seed HERMES_SESSION_* contextvars from the
+    # stored ``origin`` (which is delivery routing metadata, not a sender
+    # identity). Several tool consumers branch on these vars during job
+    # execution and would otherwise behave as if a real user from the
+    # origin chat was driving the agent:
+    #   - tools/terminal_tool.py: background-process notification routing
+    #     (notify_on_complete / watch_patterns) reads HERMES_SESSION_PLATFORM
+    #     and HERMES_SESSION_CHAT_ID to populate watcher_platform / chat_id,
+    #     which would route completion notifications to the origin chat
+    #     instead of via HERMES_CRON_AUTO_DELIVER_* below.
+    #   - tools/tts_tool.py: picks Opus vs MP3 based on
+    #     HERMES_SESSION_PLATFORM == "telegram".
+    #   - tools/skills_tool.py + agent/prompt_builder.py: per-platform
+    #     skill-disable lists and the system-prompt cache key both consume
+    #     HERMES_SESSION_PLATFORM.
+    #   - tools/send_message_tool.py: mirror source labelling and the
+    #     send_message gate read HERMES_SESSION_PLATFORM.
+    # Cron output delivery itself reads job["origin"] directly via
+    # _resolve_origin(job) and the HERMES_CRON_AUTO_DELIVER_* vars set
+    # below, so clearing HERMES_SESSION_* here does not affect delivery.
     _ctx_tokens = set_session_vars(
-        platform=origin["platform"] if origin else "",
-        chat_id=str(origin["chat_id"]) if origin else "",
-        chat_name=origin.get("chat_name", "") if origin else "",
+        platform="",
+        chat_id="",
+        chat_name="",
     )
     _cron_delivery_vars = (
         "HERMES_CRON_AUTO_DELIVER_PLATFORM",