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>

.github/dependabot.yaml

@@ -3,13 +3,13 @@
 version: 2
 updates:
   - package-ecosystem: bun
-    directory: .github/actions/codex
+    directory: .github/actions/llmx
     schedule:
       interval: weekly
   - package-ecosystem: cargo
     directories:
-      - codex-rs
-      - codex-rs/*
+      - llmx-rs
+      - llmx-rs/*
     schedule:
       interval: weekly
   - package-ecosystem: devcontainers
@@ -17,7 +17,7 @@ updates:
     schedule:
       interval: weekly
   - package-ecosystem: docker
-    directory: codex-cli
+    directory: llmx-cli
     schedule:
       interval: weekly
   - package-ecosystem: github-actions
@@ -25,6 +25,6 @@ updates:
     schedule:
       interval: weekly
   - package-ecosystem: rust-toolchain
-    directory: codex-rs
+    directory: llmx-rs
     schedule:
       interval: weekly