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>

llmx-rs/linux-sandbox/README.md

@@ -1,8 +1,8 @@
-# codex-linux-sandbox
+# llmx-linux-sandbox
 
 This crate is responsible for producing:
 
-- a `codex-linux-sandbox` standalone executable for Linux that is bundled with the Node.js version of the Codex CLI
+- a `llmx-linux-sandbox` standalone executable for Linux that is bundled with the Node.js version of the LLMX CLI
 - a lib crate that exposes the business logic of the executable as `run_main()` so that
-  - the `codex-exec` CLI can check if its arg0 is `codex-linux-sandbox` and, if so, execute as if it were `codex-linux-sandbox`
-  - this should also be true of the `codex` multitool CLI
+  - the `llmx-exec` CLI can check if its arg0 is `llmx-linux-sandbox` and, if so, execute as if it were `llmx-linux-sandbox`
+  - this should also be true of the `llmx` multitool CLI