fix(plugins): give the MCP server the hooks' data dir, release 0.3.4

mcp_server.py never calls configure_harness, so it resolved ~/.mem0/mem0-plugin while the Cursor, Kimi and Antigravity hooks use ~/.mem0/<host>-plugin. A key set in Cursor's plugin settings and cached by the sessionStart hook was invisible to search_memories. build.py now writes DATA_DIR_NAME into each bundle's _harness_id.py and memory_core seeds its default from it, like the PLATFORM_* values.

An end-to-end test launches the real session-start hook and MCP server for Claude Code, Cursor and Codex the way each host does, with the key in plugin settings and in the mem0 init config, and checks the search reaches the API with that key.

Bumps the Python plugins to 0.3.4, OpenCode to 0.4.2, Pi and DeepSeek to 0.3.3, with changelog entries for each.

Fixes #7346

integrations/claude-code-plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "mem0",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "description": "Cross-session memory and token savings for coding agents.",
   "author": {
     "name": "Mem0"

integrations/claude-code-plugin/core/_harness_id.py

@@ -2,6 +2,7 @@
 
 HARNESS_ID = "claude-code"
 SOURCE_TAG = "CLAUDE_CODE_PLUGIN"
+DATA_DIR_NAME = "claude-code-plugin"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.

integrations/claude-code-plugin/core/memory_core.py

@@ -28,12 +28,23 @@ from typing import Any, Iterable
 
 import telemetry
 
+# Read from the generated per-host module so a new entrypoint is correct without
+# remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import DATA_DIR_NAME as _DATA_DIR_NAME
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _DATA_DIR_NAME = "mem0-plugin"
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
 DEFAULT_API_URL = "https://api.mem0.ai"
-PLUGIN_VERSION = "0.3.3"
+PLUGIN_VERSION = "0.3.4"
 
 _harness_name: str = "generic"
 _harness_env_prefix: str = "MEM0_PLUGIN"
-_harness_data_dir_name: str = "mem0-plugin"
+_harness_data_dir_name: str = _DATA_DIR_NAME
 _harness_source_tag: str = "mem0_plugin"
 
 
@@ -1802,16 +1813,6 @@ def extraction_message_batches(
     return batches
 
 
-# Platform surface attribution. Read from the generated per-host module so a new
-# entrypoint is correct without remembering to configure anything.
-try:  # pragma: no cover - absent only in the un-built shared source tree
-    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
-    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
-except ImportError:
-    _PLATFORM_SOURCE = "MEM0_PLUGIN"
-    _PLATFORM_APPLICATION = ""
-
-
 def platform_headers(key: str) -> dict[str, str]:
     """Auth plus the three surface-identity headers.
 

integrations/claude-code-plugin/plugin-build.json

@@ -1,6 +1,6 @@
 {
   "id": "mem0",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "homepage": "https://docs.mem0.ai/integrations/claude-code",
   "native": {
     "pluginRoot": "${CLAUDE_PLUGIN_ROOT}",