fix(trigger): hide external trigger inputs

nanobot/cron/session_turns.py

@@ -5,16 +5,43 @@ from __future__ import annotations
 from typing import Any, Mapping
 
 from nanobot.cron.types import CronJob
+from nanobot.session.automation_turns import (
+    AutomationTurnSpec,
+    automation_history_overrides_for_spec,
+    automation_trigger,
+)
 
 CRON_TRIGGER_META = "_cron_trigger"
 CRON_DEFER_UNTIL_IDLE_META = "_cron_defer_until_session_idle"
 CRON_HISTORY_META = "_cron_turn"
 
 
+def _cron_history_text(trigger: Mapping[str, Any]) -> str | None:
+    persist_content = trigger.get("persist_content")
+    return (
+        persist_content
+        if isinstance(persist_content, str) and persist_content.strip()
+        else None
+    )
+
+
+CRON_AUTOMATION_SPEC = AutomationTurnSpec(
+    kind="cron",
+    trigger_meta_key=CRON_TRIGGER_META,
+    legacy_history_meta_key=CRON_HISTORY_META,
+    history_fields={
+        "cron_job_id": "job_id",
+        "cron_job_name": "job_name",
+        "cron_run_id": "run_id",
+        "cron_prompt_ref": "prompt_ref",
+    },
+    text_builder=_cron_history_text,
+)
+
+
 def cron_trigger(metadata: Mapping[str, Any] | None) -> dict[str, Any] | None:
     """Return structured cron trigger metadata when present."""
-    raw = (metadata or {}).get(CRON_TRIGGER_META)
-    return raw if isinstance(raw, dict) else None
+    return automation_trigger(metadata, CRON_AUTOMATION_SPEC)
 
 
 def is_cron_turn(metadata: Mapping[str, Any] | None) -> bool:
@@ -38,22 +65,7 @@ def cron_run_id(metadata: Mapping[str, Any] | None) -> str | None:
 
 def cron_history_overrides(metadata: Mapping[str, Any] | None) -> tuple[str | None, dict[str, Any]]:
     """Return session-history text/metadata overrides for a cron turn."""
-    trigger = cron_trigger(metadata)
-    if not trigger:
-        return None, {}
-    persist_content = trigger.get("persist_content")
-    text = (
-        persist_content
-        if isinstance(persist_content, str) and persist_content.strip()
-        else None
-    )
-    return text, {
-        CRON_HISTORY_META: True,
-        "cron_job_id": trigger.get("job_id"),
-        "cron_job_name": trigger.get("job_name"),
-        "cron_run_id": trigger.get("run_id"),
-        "cron_prompt_ref": trigger.get("prompt_ref"),
-    }
+    return automation_history_overrides_for_spec(metadata, CRON_AUTOMATION_SPEC)
 
 
 def is_bound_cron_job(job: CronJob) -> bool: