Remove AI assistant references and update .gitignore

- Remove Claude/Anthropic mentions from README.md and docs/AI_System_Design.md
- Delete claude.md configuration file
- Add comprehensive AI assistant patterns to .gitignore
- Add docs/RAG_101.md

Author: asq-sheriff

.gitignore

@@ -286,3 +286,11 @@ __pycache__/
 .claude
 .claude_ignore
 .claude_workflows
+claude.md
+CLAUDE.md
+claude_sessions/
+.cursor/
+.aider*
+.continue/
+copilot*
+.github/copilot*