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>

llmx-rs/mcp-types/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

llmx-rs/mcp-types/tests/suite/initialize.rs

@@ -0,0 +1,70 @@
+use mcp_types::ClientCapabilities;
+use mcp_types::ClientRequest;
+use mcp_types::Implementation;
+use mcp_types::InitializeRequestParams;
+use mcp_types::JSONRPC_VERSION;
+use mcp_types::JSONRPCMessage;
+use mcp_types::JSONRPCRequest;
+use mcp_types::RequestId;
+use serde_json::json;
+
+#[test]
+fn deserialize_initialize_request() {
+    let raw = r#"{
+        "jsonrpc": "2.0",
+        "id": 1,
+        "method": "initialize",
+        "params": {
+            "capabilities": {},
+            "clientInfo": { "name": "acme-client", "title": "Acme", "version": "1.2.3" },
+            "protocolVersion": "2025-06-18"
+        }
+    }"#;
+
+    // Deserialize full JSONRPCMessage first.
+    let msg: JSONRPCMessage =
+        serde_json::from_str(raw).expect("failed to deserialize JSONRPCMessage");
+
+    // Extract the request variant.
+    let JSONRPCMessage::Request(json_req) = msg else {
+        unreachable!()
+    };
+
+    let expected_req = JSONRPCRequest {
+        jsonrpc: JSONRPC_VERSION.into(),
+        id: RequestId::Integer(1),
+        method: "initialize".into(),
+        params: Some(json!({
+            "capabilities": {},
+            "clientInfo": { "name": "acme-client", "title": "Acme", "version": "1.2.3" },
+            "protocolVersion": "2025-06-18"
+        })),
+    };
+
+    assert_eq!(json_req, expected_req);
+
+    let client_req: ClientRequest =
+        ClientRequest::try_from(json_req).expect("conversion must succeed");
+    let ClientRequest::InitializeRequest(init_params) = client_req else {
+        unreachable!()
+    };
+
+    assert_eq!(
+        init_params,
+        InitializeRequestParams {
+            capabilities: ClientCapabilities {
+                experimental: None,
+                roots: None,
+                sampling: None,
+                elicitation: None,
+            },
+            client_info: Implementation {
+                name: "acme-client".into(),
+                title: Some("Acme".to_string()),
+                version: "1.2.3".into(),
+                user_agent: None,
+            },
+            protocol_version: "2025-06-18".into(),
+        }
+    );
+}

llmx-rs/mcp-types/tests/suite/mod.rs

@@ -0,0 +1,3 @@
+// Aggregates all former standalone integration tests as modules.
+mod initialize;
+mod progress_notification;

llmx-rs/mcp-types/tests/suite/progress_notification.rs

@@ -0,0 +1,43 @@
+use mcp_types::JSONRPCMessage;
+use mcp_types::ProgressNotificationParams;
+use mcp_types::ProgressToken;
+use mcp_types::ServerNotification;
+
+#[test]
+fn deserialize_progress_notification() {
+    let raw = r#"{
+        "jsonrpc": "2.0",
+        "method": "notifications/progress",
+        "params": {
+            "message": "Half way there",
+            "progress": 0.5,
+            "progressToken": 99,
+            "total": 1.0
+        }
+    }"#;
+
+    // Deserialize full JSONRPCMessage first.
+    let msg: JSONRPCMessage = serde_json::from_str(raw).expect("invalid JSONRPCMessage");
+
+    // Extract the notification variant.
+    let JSONRPCMessage::Notification(notif) = msg else {
+        unreachable!()
+    };
+
+    // Convert via generated TryFrom.
+    let server_notif: ServerNotification =
+        ServerNotification::try_from(notif).expect("conversion must succeed");
+
+    let ServerNotification::ProgressNotification(params) = server_notif else {
+        unreachable!()
+    };
+
+    let expected_params = ProgressNotificationParams {
+        message: Some("Half way there".into()),
+        progress: 0.5,
+        progress_token: ProgressToken::Integer(99),
+        total: Some(1.0),
+    };
+
+    assert_eq!(params, expected_params);
+}