Add Memory Gateway agent plugin

plugins/memory-gateway-agent/memory_gateway_plugin/policy.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+import re
+from typing import Any
+
+from .config import PluginConfig, load_config
+from .safety import validate_memory_write
+
+
+REMEMBER_RE = re.compile(r"记住|请保存|remember this|save this|keep in memory", re.I)
+STABLE_SIGNAL_RE = re.compile(
+    r"偏好|长期|约束|架构决策|决策|结论|workflow|工作流|preference|constraint|decision|always|以后都|project fact",
+    re.I,
+)
+SMALL_TALK_RE = re.compile(r"^\s*(你好|hi|hello|谢谢|thanks|ok|好的|收到|再见)[。.!！\s\w]*$", re.I)
+
+
+def should_search_memory(user_message: str, context: dict[str, Any] | None = None, config: PluginConfig | None = None) -> bool:
+    cfg = config or load_config()
+    if not cfg.auto_search:
+        return False
+    return bool(user_message and user_message.strip())
+
+
+def should_append_episode(
+    user_message: str,
+    assistant_response: str = "",
+    context: dict[str, Any] | None = None,
+    config: PluginConfig | None = None,
+) -> bool:
+    cfg = config or load_config()
+    if not cfg.auto_append_episode:
+        return False
+    combined = "\n".join(part for part in [user_message, assistant_response] if part)
+    if not combined.strip() or SMALL_TALK_RE.match(combined.strip()):
+        return False
+    if not validate_memory_write(combined)["allowed"]:
+        return False
+    return bool(REMEMBER_RE.search(combined) or STABLE_SIGNAL_RE.search(combined))
+
+
+def build_episode_summary(user_message: str, assistant_response: str = "", context: dict[str, Any] | None = None) -> str:
+    parts = []
+    if REMEMBER_RE.search(user_message or ""):
+        parts.append(f"用户明确要求记住：{user_message.strip()}")
+    elif user_message:
+        parts.append(f"用户输入中的可复用信息：{user_message.strip()}")
+    if assistant_response and STABLE_SIGNAL_RE.search(assistant_response):
+        parts.append(f"助手结论：{assistant_response.strip()}")
+    summary = " ".join(parts).strip()
+    return summary[:1000]
+
+
+def should_commit_session(context: dict[str, Any] | None = None, config: PluginConfig | None = None) -> bool:
+    cfg = config or load_config()
+    if cfg.auto_commit_session:
+        return True
+    return bool((context or {}).get("force_commit"))
+