docs(memory): update skills for opencode-memory plugin, deprecate mem0

skills/memory/references/deployment.md

@@ -0,0 +1,54 @@
+# opencode-memory Deployment Guide
+
+## Installation
+
+### Option 1: Nix (Recommended)
+
+Add to your Nix flake:
+
+```nix
+inputs.opencode-memory = {
+  url = "git+https://code.m3ta.dev/m3tam3re/opencode-memory";
+  flake = false;
+};
+```
+
+### Option 2: npm
+
+```bash
+npm install -g @m3tam3re/opencode-memory
+```
+
+## Configuration
+
+Add to `~/.config/opencode/opencode.json`:
+
+```json
+{
+  "plugins": [
+    "opencode-memory"
+  ]
+}
+```
+
+## Environment Variables
+
+- `OPENAI_API_KEY`: Required for embeddings
+
+## Vault Location
+
+Default: `~/CODEX/80-memory/`
+
+Override in plugin config if needed.
+
+## Rebuild Index
+
+```bash
+bun run src/cli.ts --rebuild
+```
+
+## Verification
+
+1. Start Opencode
+2. Call `memory_search` with any query
+3. Verify no errors in logs