Phase 2: Rust Workspace Transformation (Part 1)

- Renamed directory: codex-backend-openapi-models -> llmx-backend-openapi-models
- Updated all Cargo.toml files:
  - Package names: codex-* -> llmx-*
  - Library names: codex_* -> llmx_*
  - Workspace dependencies updated
- Renamed Rust source files:
  - codex*.rs -> llmx*.rs (all modules)
  - codex_conversation -> llmx_conversation
  - codex_delegate -> llmx_delegate
  - codex_message_processor -> llmx_message_processor
  - codex_tool_* -> llmx_tool_*
- Updated all Rust imports:
  - use codex_* -> use llmx_*
  - mod codex* -> mod llmx*
- Updated environment variables in code:
  - CODEX_HOME -> LLMX_HOME
  - .codex -> .llmx paths
- Updated protocol crate lib name for proper linking

Note: Some compilation errors remain (type inference issues) but all
renaming is complete. Will fix compilation in next phase.

🤖 Generated with Claude Code

llmx-rs/linux-sandbox/tests/suite/landlock.rs

@@ -1,12 +1,12 @@
 #![cfg(target_os = "linux")]
-use codex_core::config::types::ShellEnvironmentPolicy;
-use codex_core::error::CodexErr;
-use codex_core::error::SandboxErr;
-use codex_core::exec::ExecParams;
-use codex_core::exec::SandboxType;
-use codex_core::exec::process_exec_tool_call;
-use codex_core::exec_env::create_env;
-use codex_core::protocol::SandboxPolicy;
+use llmx_core::config::types::ShellEnvironmentPolicy;
+use llmx_core::error::CodexErr;
+use llmx_core::error::SandboxErr;
+use llmx_core::exec::ExecParams;
+use llmx_core::exec::SandboxType;
+use llmx_core::exec::process_exec_tool_call;
+use llmx_core::exec_env::create_env;
+use llmx_core::protocol::SandboxPolicy;
 use std::collections::HashMap;
 use std::path::PathBuf;
 use tempfile::NamedTempFile;