Add Memory Gateway agent plugin

plugins/memory-gateway-agent/policies/memory_policy.md

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+# Memory Gateway Agent Policy
+
+Use Memory Gateway as a shared memory adapter. It is not a transcript store.
+
+At conversation start:
+
+- Search memory when previous context may matter.
+- Use `memory_search` with the current `user_id`, `agent_id`, `workspace_id`, and `session_id`.
+- Inject only compact relevant memory summaries into the working context.
+
+During a task:
+
+- Write only candidate episode summaries with `memory_append_episode`.
+- Save stable preferences, long-term project facts, architecture decisions, durable constraints, reusable workflows, and completed task conclusions.
+- Do not save complete raw conversations, chain-of-thought, large logs, one-time values, or secrets.
+
+At task or session completion:
+
+- Use `memory_commit_session` to let Memory Gateway and EverMemOS decide what can be promoted.
+- Do not promote all episodes directly to long-term memory.
+- Conflicting or high-value memories should enter review rather than overwrite existing memory.
+
+When the user says to forget or reject memory:
+
+- Use `memory_feedback` with `incorrect`, `outdated`, or `not_useful`.
+- Use delete-capable tools only when the runtime exposes them and access control allows it.
+
+Default automation:
+
+- Auto search may be enabled.
+- Auto append episode may be enabled for safe summaries.
+- Auto commit is disabled by default.
+- Auto direct long-term upsert is disabled by default.
+