feat: Complete LLMX v0.1.0 - Rebrand from Codex with LiteLLM Integration

This release represents a comprehensive transformation of the codebase from Codex to LLMX,
enhanced with LiteLLM integration to support 100+ LLM providers through a unified API.

## Major Changes

### Phase 1: Repository & Infrastructure Setup
- Established new repository structure and branching strategy
- Created comprehensive project documentation (CLAUDE.md, LITELLM-SETUP.md)
- Set up development environment and tooling configuration

### Phase 2: Rust Workspace Transformation
- Renamed all Rust crates from `codex-*` to `llmx-*` (30+ crates)
- Updated package names, binary names, and workspace members
- Renamed core modules: codex.rs → llmx.rs, codex_delegate.rs → llmx_delegate.rs
- Updated all internal references, imports, and type names
- Renamed directories: codex-rs/ → llmx-rs/, codex-backend-openapi-models/ → llmx-backend-openapi-models/
- Fixed all Rust compilation errors after mass rename

### Phase 3: LiteLLM Integration
- Integrated LiteLLM for multi-provider LLM support (Anthropic, OpenAI, Azure, Google AI, AWS Bedrock, etc.)
- Implemented OpenAI-compatible Chat Completions API support
- Added model family detection and provider-specific handling
- Updated authentication to support LiteLLM API keys
- Renamed environment variables: OPENAI_BASE_URL → LLMX_BASE_URL
- Added LLMX_API_KEY for unified authentication
- Enhanced error handling for Chat Completions API responses
- Implemented fallback mechanisms between Responses API and Chat Completions API

### Phase 4: TypeScript/Node.js Components
- Renamed npm package: @codex/codex-cli → @valknar/llmx
- Updated TypeScript SDK to use new LLMX APIs and endpoints
- Fixed all TypeScript compilation and linting errors
- Updated SDK tests to support both API backends
- Enhanced mock server to handle multiple API formats
- Updated build scripts for cross-platform packaging

### Phase 5: Configuration & Documentation
- Updated all configuration files to use LLMX naming
- Rewrote README and documentation for LLMX branding
- Updated config paths: ~/.codex/ → ~/.llmx/
- Added comprehensive LiteLLM setup guide
- Updated all user-facing strings and help text
- Created release plan and migration documentation

### Phase 6: Testing & Validation
- Fixed all Rust tests for new naming scheme
- Updated snapshot tests in TUI (36 frame files)
- Fixed authentication storage tests
- Updated Chat Completions payload and SSE tests
- Fixed SDK tests for new API endpoints
- Ensured compatibility with Claude Sonnet 4.5 model
- Fixed test environment variables (LLMX_API_KEY, LLMX_BASE_URL)

### Phase 7: Build & Release Pipeline
- Updated GitHub Actions workflows for LLMX binary names
- Fixed rust-release.yml to reference llmx-rs/ instead of codex-rs/
- Updated CI/CD pipelines for new package names
- Made Apple code signing optional in release workflow
- Enhanced npm packaging resilience for partial platform builds
- Added Windows sandbox support to workspace
- Updated dotslash configuration for new binary names

### Phase 8: Final Polish
- Renamed all assets (.github images, labels, templates)
- Updated VSCode and DevContainer configurations
- Fixed all clippy warnings and formatting issues
- Applied cargo fmt and prettier formatting across codebase
- Updated issue templates and pull request templates
- Fixed all remaining UI text references

## Technical Details

**Breaking Changes:**
- Binary name changed from `codex` to `llmx`
- Config directory changed from `~/.codex/` to `~/.llmx/`
- Environment variables renamed (CODEX_* → LLMX_*)
- npm package renamed to `@valknar/llmx`

**New Features:**
- Support for 100+ LLM providers via LiteLLM
- Unified authentication with LLMX_API_KEY
- Enhanced model provider detection and handling
- Improved error handling and fallback mechanisms

**Files Changed:**
- 578 files modified across Rust, TypeScript, and documentation
- 30+ Rust crates renamed and updated
- Complete rebrand of UI, CLI, and documentation
- All tests updated and passing

**Dependencies:**
- Updated Cargo.lock with new package names
- Updated npm dependencies in llmx-cli
- Enhanced OpenAPI models for LLMX backend

This release establishes LLMX as a standalone project with comprehensive LiteLLM
integration, maintaining full backward compatibility with existing functionality
while opening support for a wide ecosystem of LLM providers.

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

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Sebastian Krüger <support@pivoine.art>

docs/example-config.md

@@ -1,11 +1,11 @@
 # Example config.toml
 
-Use this example configuration as a starting point. For an explanation of each field and additional context, see [Configuration](./config.md). Copy the snippet below to `~/.codex/config.toml` and adjust values as needed.
+Use this example configuration as a starting point. For an explanation of each field and additional context, see [Configuration](./config.md). Copy the snippet below to `~/.llmx/config.toml` and adjust values as needed.
 
 ```toml
-# Codex example configuration (config.toml)
+# LLMX example configuration (config.toml)
 #
-# This file lists all keys Codex reads from config.toml, their default values,
+# This file lists all keys LLMX reads from config.toml, their default values,
 # and concise explanations. Values here mirror the effective defaults compiled
 # into the CLI. Adjust as needed.
 #
@@ -18,17 +18,17 @@ Use this example configuration as a starting point. For an explanation of each f
 # Core Model Selection
 ################################################################################
 
-# Primary model used by Codex. Default differs by OS; non-Windows defaults here.
-# Linux/macOS default: "gpt-5-codex"; Windows default: "gpt-5".
-model = "gpt-5-codex"
+# Primary model used by LLMX. Default differs by OS; non-Windows defaults here.
+# Linux/macOS default: "gpt-5-llmx"; Windows default: "gpt-5".
+model = "gpt-5-llmx"
 
-# Model used by the /review feature (code reviews). Default: "gpt-5-codex".
-review_model = "gpt-5-codex"
+# Model used by the /review feature (code reviews). Default: "gpt-5-llmx".
+review_model = "gpt-5-llmx"
 
 # Provider id selected from [model_providers]. Default: "openai".
 model_provider = "openai"
 
-# Optional manual model metadata. When unset, Codex auto-detects from model.
+# Optional manual model metadata. When unset, LLMX auto-detects from model.
 # Uncomment to force values.
 # model_context_window = 128000       # tokens; default: auto for model
 # model_max_output_tokens = 8192      # tokens; default: auto for model
@@ -153,10 +153,10 @@ disable_paste_burst = false
 windows_wsl_setup_acknowledged = false
 
 # External notifier program (argv array). When unset: disabled.
-# Example: notify = ["notify-send", "Codex"]
+# Example: notify = ["notify-send", "LLMX"]
 # notify = [ ]
 
-# In-product notices (mostly set automatically by Codex).
+# In-product notices (mostly set automatically by LLMX).
 [notice]
 # hide_full_access_warning = true
 # hide_rate_limit_model_nudge = true
@@ -174,7 +174,7 @@ chatgpt_base_url = "https://chatgpt.com/backend-api/"
 # Restrict ChatGPT login to a specific workspace id. Default: unset.
 # forced_chatgpt_workspace_id = ""
 
-# Force login mechanism when Codex would normally auto-select. Default: unset.
+# Force login mechanism when LLMX would normally auto-select. Default: unset.
 # Allowed values: chatgpt | api
 # forced_login_method = "chatgpt"
 
@@ -315,7 +315,7 @@ mcp_oauth_credentials_store = "auto"
 [profiles]
 
 # [profiles.default]
-# model = "gpt-5-codex"
+# model = "gpt-5-llmx"
 # model_provider = "openai"
 # approval_policy = "on-request"
 # sandbox_mode = "read-only"