chore: remove sub-directory CLAUDE.md files and .cursor/rules

Remove 82 auto-generated CLAUDE.md files scattered across subdirectories
and 3 .cursor/rules/*.mdc files. Keep only the top-level CLAUDE.md.

Author: samcm

.cursor/rules/code_standards.mdc

@@ -1,15 +1,3 @@
 # Xatu
 
 Ethereum network monitoring with collection clients and a centralized server for data pipelining.
-
-## Project Structure
-Claude MUST read the `.cursor/rules/project_architecture.mdc` file before making any structural changes to the project.
-
-## Code Standards  
-Claude MUST read the `.cursor/rules/code_standards.mdc` file before writing any code in this project.
-
-## Development Workflow
-Claude MUST read the `.cursor/rules/development_workflow.mdc` file before making changes to build, test, or deployment configurations.
-
-## Component Documentation
-Individual components have their own CLAUDE.md files with component-specific rules. Always check for and read component-level documentation when working on specific parts of the codebase.