feat(mem0-plugin): add OpenCode & Antigravity plugins, CC parity, docs cleanup (#5268)

mem0-plugin/scripts/_identity.py

@@ -2,7 +2,7 @@
 
 API key resolution (first non-empty wins):
   1. MEM0_API_KEY env var (explicit / shell profile)
-  2. CLAUDE_PLUGIN_OPTION_API_KEY (set by `claude plugin configure mem0`)
+  2. CLAUDE_PLUGIN_OPTION_API_KEY (injected by Claude Code userConfig)
   3. CLAUDE_PLUGIN_OPTION_MEM0_API_KEY (legacy userConfig)
   4. Extract from shell profile files (~/.zshrc, ~/.bashrc, etc.)
      Desktop app doesn't inherit shell env — this covers users who

mem0-plugin/scripts/_identity.sh

@@ -2,7 +2,7 @@
 #
 # API key resolution (first non-empty wins):
 #   1. MEM0_API_KEY env var (explicit / shell profile)
-#   2. CLAUDE_PLUGIN_OPTION_API_KEY (set by `claude plugin configure mem0`)
+#   2. CLAUDE_PLUGIN_OPTION_API_KEY (injected by Claude Code userConfig)
 #   3. CLAUDE_PLUGIN_OPTION_MEM0_API_KEY (legacy userConfig)
 #   4. Extract from shell profile files (~/.zshrc, ~/.bashrc, etc.)
 #      Desktop app doesn't inherit shell env — this fallback covers users

mem0-plugin/scripts/on_session_start.sh

@@ -53,7 +53,8 @@ Mem0 — Setup Required | user=${_UID} | project=${_PID} | branch=${_BR} | auth=
 \`\`\`
 
 MEM0_API_KEY is not set. To configure:
-- **Desktop app**: Run \`claude plugin configure mem0\` in the built-in terminal, or add \`MEM0_API_KEY\` in the Desktop app's environment editor (Settings → Environment)
+- **Reinstall the plugin**: Uninstall and reinstall — Claude Code will prompt for your API key during setup (stored securely in keychain)
+- **Desktop app**: Click the environment dropdown next to the prompt box → hover over **Local** → click the **gear icon** → add \`MEM0_API_KEY=m0-...\`
 - **CLI**: Add \`export MEM0_API_KEY=m0-...\` to your shell profile (~/.zshrc or ~/.bashrc)
 - Get a key at https://app.mem0.ai/dashboard/api-keys