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

.chezmoiignore

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+# Opencode ephemeral files and machine-specific data
+.local/share/opencode/auth.json
+.local/share/opencode/mcp-auth.json
+.local/share/opencode/log/
+.local/share/opencode/snapshot/
+.local/share/opencode/storage/
+.local/share/opencode/bin/
+
+# Opencode plugin dependencies and generated files
+.config/opencode/node_modules/
+.config/opencode/bun.lock
+.config/opencode/package.json
+.config/opencode/.gitignore
+.config/opencode/.claude/
+.config/opencode/plugin/

home/dot_config/opencode/command/.keep

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+# This file ensures the command directory is created by chezmoi

home/dot_config/opencode/command/symlink_commit-staged.md

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+../../../.claude/commands/commit-staged.md

home/dot_config/opencode/dcp.jsonc

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+{
+  // Enable or disable the plugin
+  "enabled": true,
+  // Enable debug logging to ~/.config/opencode/logs/dcp/
+  "debug": false,
+  // Summary display: "off", "minimal", or "detailed"
+  "pruningSummary": "detailed",
+  // Strategies for pruning tokens from chat history
+  "strategies": {
+    // Remove duplicate tool calls (same tool with same arguments)
+    "deduplication": {
+      "enabled": true,
+      // Additional tools to protect from pruning
+      "protectedTools": []
+    },
+    // Prune write tool inputs when the file has been subsequently read
+    "supersedeWrites": {
+      "enabled": true
+    },
+    // Exposes a prune tool to your LLM to call when it determines pruning is necessary
+    "pruneTool": {
+      "enabled": true,
+      // Additional tools to protect from pruning
+      "protectedTools": [],
+      // Nudge the LLM to use the prune tool (every <frequency> tool results)
+      "nudge": {
+        "enabled": true,
+        "frequency": 10
+      }
+    },
+    // (Legacy) Run an LLM to analyze what tool calls are no longer relevant on idle
+    "onIdle": {
+      "enabled": false,
+      // Additional tools to protect from pruning
+      "protectedTools": [],
+      // Override model for analysis (format: "provider/model")
+      // "model": "anthropic/claude-haiku-4-5",
+      // Show toast notifications when model selection fails
+      "showModelErrorToasts": true,
+      // When true, fallback models are not permitted
+      "strictModelSelection": false
+    }
+  }
+}

home/dot_config/opencode/opencode.jsonc.tmpl

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+{
+  "$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": {}
+    }
+  }
+}

home/dot_config/opencode/symlink_AGENTS.md

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+../../.claude/CLAUDE.md