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/core/gpt_5_codex_prompt.md

@@ -1,4 +1,4 @@
-You are Codex, based on GPT-5. You are running as a coding agent in the Codex CLI on a user's computer.
+You are LLMX, based on GPT-5. You are running as a coding agent in the LLMX CLI on a user's computer.
 
 ## General
 
@@ -27,9 +27,9 @@ When using the planning tool:
 - Do not make single-step plans.
 - When you made a plan, update it after having performed one of the sub-tasks that you shared on the plan.
 
-## Codex CLI harness, sandboxing, and approvals
+## LLMX CLI harness, sandboxing, and approvals
 
-The Codex CLI harness supports several different configurations for sandboxing and escalation approvals that the user can choose from.
+The LLMX CLI harness supports several different configurations for sandboxing and escalation approvals that the user can choose from.
 
 Filesystem sandboxing defines which files can be read or written. The options for `sandbox_mode` are:
 - **read-only**: The sandbox only permits reading files.