Add Memory Gateway agent plugin

plugins/memory-gateway-agent/hermes.plugin.yaml

@@ -0,0 +1,41 @@
+name: memory-gateway-agent
+runtime: hermes
+version: 0.1.0
+description: Hermes plugin adapter for Memory Gateway v1. Provides tools-only mode plus best-effort lifecycle hooks.
+entrypoint: register
+provides_tools:
+  - memory_search
+  - memory_append_episode
+  - memory_commit_session
+  - memory_upsert
+  - memory_feedback
+provides_hooks:
+  - on_session_start
+  - pre_llm_call
+  - post_llm_call
+  - on_session_end
+env:
+  MEMORY_GATEWAY_URL: http://127.0.0.1:1934
+  MEMORY_GATEWAY_AUTO_SEARCH: "true"
+  MEMORY_GATEWAY_AUTO_APPEND_EPISODE: "true"
+  MEMORY_GATEWAY_AUTO_COMMIT_SESSION: "false"
+tools:
+  memory_search:
+    description: Search Memory Gateway with user/agent/workspace/session ACL.
+  memory_append_episode:
+    description: Append a safe summarized candidate episode.
+  memory_commit_session:
+    description: Ask Gateway/EverMemOS to consolidate session episodes.
+  memory_upsert:
+    description: Upsert a stable memory through Gateway.
+  memory_feedback:
+    description: Send feedback for a memory record.
+hooks:
+  on_session_start: __init__:on_session_start
+  pre_llm_call: __init__:pre_llm_call
+  post_llm_call: __init__:post_llm_call
+  on_session_end: __init__:on_session_end
+notes:
+  - Hooks are best-effort and depend on the Hermes runtime context API.
+  - Without hook support, the plugin remains usable as tools-only.
+  - This plugin does not store full raw conversations.