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/open-source-fund.md

@@ -1,8 +1,8 @@
-## Codex open source fund
+## LLMX open source fund
 
-We're excited to launch a **$1 million initiative** supporting open source projects that use Codex CLI and other OpenAI models.
+We're excited to launch a **$1 million initiative** supporting open source projects that use LLMX CLI and other OpenAI models.
 
 - Grants are awarded up to **$25,000** API credits.
 - Applications are reviewed **on a rolling basis**.
 
-**Interested? [Apply here](https://openai.com/form/codex-open-source-fund/).**
+**Interested? [Apply here](https://openai.com/form/llmx-open-source-fund/).**