feat(scheduler): add scheduled jobs with channel-aware delivery

Introduce persisted cron/interval jobs, gateway scheduler loop, worker turns,
and admin CRUD/edit UI. Route proactive reminders via the originating chat
channel (WhatsApp vs WeChat), harden Weixin outbound with durable queue and
PG-compatible polling, and fix chat UI to show each scheduled reminder separately.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/tools/context_inject.py

@@ -0,0 +1,70 @@
+from __future__ import annotations
+
+from typing import Any
+
+_CONTEXT_SCOPED_TOOL_PREFIXES = ("schedule_", "todo_")
+_CONTEXT_SCOPED_TOOL_NAMES = frozenset(
+    {
+        "kb_add",
+        "kb_search",
+    }
+)
+
+
+def _session_owner(store: Any, session_id: str) -> tuple[str, str]:
+    sid = str(session_id or "").strip()
+    if not sid:
+        return "", ""
+    try:
+        owner = store.get_ui_session_owner(session_id=sid) or {}
+    except Exception:
+        owner = {}
+    if isinstance(owner, dict):
+        tid = str(owner.get("tenant_id") or "").strip()
+        uid = str(owner.get("user_id") or "").strip()
+        if tid and uid:
+            return tid, uid
+    return "", ""
+
+
+def enrich_tool_arguments(
+    *,
+    store: Any,
+    session_id: str,
+    tool_name: str,
+    arguments: dict[str, Any] | None,
+    path_policy_tenant_id: str | None = None,
+    path_policy_user_id: str | None = None,
+) -> dict[str, Any]:
+    """Inject tenant/user/session context for productivity tools (WeChat, WhatsApp, etc.)."""
+    merged = dict(arguments or {})
+    name = str(tool_name or "").strip()
+    if not name:
+        return merged
+    scoped = name in _CONTEXT_SCOPED_TOOL_NAMES or any(
+        name.startswith(p) for p in _CONTEXT_SCOPED_TOOL_PREFIXES
+    )
+    if not scoped:
+        return merged
+
+    tenant_id = str(path_policy_tenant_id or merged.get("tenant_id") or "").strip()
+    user_id = str(path_policy_user_id or merged.get("owner_user_id") or merged.get("user_id") or "").strip()
+    if not tenant_id or not user_id:
+        o_tid, o_uid = _session_owner(store, session_id)
+        tenant_id = tenant_id or o_tid
+        user_id = user_id or o_uid
+
+    if tenant_id:
+        merged["tenant_id"] = tenant_id
+    if user_id:
+        if name in _CONTEXT_SCOPED_TOOL_NAMES:
+            merged["user_id"] = user_id
+        else:
+            merged["owner_user_id"] = user_id
+    sid = str(session_id or merged.get("session_id") or "").strip()
+    if sid:
+        merged["session_id"] = sid
+    return merged
+
+
+__all__ = ["enrich_tool_arguments"]