Phase 5: Configuration & Documentation

Updated all documentation and configuration files:

Documentation changes:
- Updated README.md to describe LLMX as LiteLLM-powered fork
- Updated CLAUDE.md with LiteLLM integration details
- Updated 50+ markdown files across docs/, llmx-rs/, llmx-cli/, sdk/
- Changed all references: codex → llmx, Codex → LLMX
- Updated package references: @openai/codex → @llmx/llmx
- Updated repository URLs: github.com/openai/codex → github.com/valknar/llmx

Configuration changes:
- Updated .github/dependabot.yaml
- Updated .github workflow files
- Updated cliff.toml (changelog configuration)
- Updated Cargo.toml comments

Key branding updates:
- Project description: "coding agent from OpenAI" → "coding agent powered by LiteLLM"
- Added attribution to original OpenAI Codex project
- Documented LiteLLM integration benefits

Files changed: 51 files (559 insertions, 559 deletions)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/CLA.md

@@ -4,7 +4,7 @@ _Based on the Apache Software Foundation Individual CLA v 2.2._
 
 By commenting **“I have read the CLA Document and I hereby sign the CLA”**
 on a Pull Request, **you (“Contributor”) agree to the following terms** for any
-past and future “Contributions” submitted to the **OpenAI Codex CLI project
+past and future “Contributions” submitted to the **OpenAI LLMX CLI project
 (the “Project”)**.
 
 ---