feat: add opencode configuration with MCP servers and DCP plugin

- Configure context7, gh_grep, and linear MCP servers
- Add DCP plugin for context pruning with detailed summaries
- Symlink AGENTS.md and commit-staged command from claude config
- Add chezmoiignore for opencode ephemeral/generated files

home/dot_config/opencode/opencode.jsonc.tmpl

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": [
+    "@tarquinen/opencode-dcp@latest",
+    "@franlol/opencode-md-table-formatter@0.0.3",
+    // "file:///home/xevion/projects/opencode-anthropic-websearch/dist/index.js"
+  ],
+  "mcp": {
+    "context7": {
+      "type": "remote",
+      "url": "https://mcp.context7.com/mcp",
+      "headers": {
+        "CONTEXT7_API_KEY": "{{ dopplerProjectJson.CONTEXT7_API_KEY }}"
+      }
+    },
+    "gh_grep": {
+      "type": "remote",
+      "url": "https://mcp.grep.app"
+    },
+    "linear": {
+      "type": "remote",
+      "url": "https://mcp.linear.app/mcp",
+      "oauth": {}
+    }
+  }
+}