chore: Add agentic coding tooling

.crosslink/rules/odin.md

@@ -0,0 +1,53 @@
+### Odin Best Practices
+
+#### Code Style
+- Follow Odin naming conventions
+- Use `snake_case` for procedures and variables
+- Use `Pascal_Case` for types
+- Prefer explicit over implicit
+
+```odin
+// GOOD: Clear Odin code
+User :: struct {
+    id:   string,
+    name: string,
+}
+
+find_user :: proc(id: string) -> (User, bool) {
+    user, found := repository[id]
+    return user, found
+}
+```
+
+#### Error Handling
+- Use multiple return values for errors
+- Use `or_return` for early returns
+- Create explicit error types when needed
+
+```odin
+// GOOD: Explicit error handling
+Config_Error :: enum {
+    File_Not_Found,
+    Parse_Error,
+}
+
+load_config :: proc(path: string) -> (Config, Config_Error) {
+    data, ok := os.read_entire_file(path)
+    if !ok {
+        return {}, .File_Not_Found
+    }
+    defer delete(data)
+
+    config, parse_ok := parse_config(data)
+    if !parse_ok {
+        return {}, .Parse_Error
+    }
+    return config, nil
+}
+```
+
+#### Memory Management
+- Use explicit allocators
+- Prefer temp allocator for short-lived allocations
+- Use `defer` for cleanup
+- Be explicit about ownership