Setup dev container and MCP infrastructure

Add dev container configuration with docker-compose, Dockerfile, and entrypoint script

- Create .devcontainer/devcontainer.json for VS Code dev container
- Create .devcontainer/docker-compose.yml for container setup
- Add Dockerfile with Python, Go, Rust, R, and jj tools
- Add docker-entrypoint.sh to initialize .ai_index and start mcp-server
- Add Makefile for container management and MCP operations
- Add .gitignore entries for AI index
- Add OpenCode global instructions
- Add basic MCP server and tool for listing Go imports
- Add Zed integration configuration
- Update README with project vision and structure

.opencode/instructions.md

@@ -0,0 +1,29 @@
+# OpenCode Global Instructions
+
+## Path handling rules
+
+- Always use relative paths.
+- Never generate absolute paths (e.g. /Users/..., /home/..., C:\...).
+- Never assume a specific username, OS, or local filesystem layout.
+- All paths must be relative to the project root unless explicitly specified.
+- Do not guess the current working directory.
+- If the working directory is ambiguous, ask for clarification instead of inventing one.
+
+## Workspace assumptions
+
+- Assume the workspace root is the repository root.
+- Do not hardcode environment-specific values.
+- Do not infer the machine, OS, or home directory.
+
+## File generation rules
+
+- Generate only the requested file.
+- Do not modify unrelated files.
+- Do not add additional configuration unless explicitly requested.
+- Output valid JSON with no comments when JSON is requested.
+
+## Determinism
+
+- Avoid creative alternatives.
+- Do not propose multiple solutions unless asked.
+- Produce a single, minimal, correct implementation.