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/execpolicy/src/main.rs

@@ -1,12 +1,12 @@
 use anyhow::Result;
 use clap::Parser;
 use clap::Subcommand;
-use codex_execpolicy::ExecCall;
-use codex_execpolicy::MatchedExec;
-use codex_execpolicy::Policy;
-use codex_execpolicy::PolicyParser;
-use codex_execpolicy::ValidExec;
-use codex_execpolicy::get_default_policy;
+use llmx_execpolicy::ExecCall;
+use llmx_execpolicy::MatchedExec;
+use llmx_execpolicy::Policy;
+use llmx_execpolicy::PolicyParser;
+use llmx_execpolicy::ValidExec;
+use llmx_execpolicy::get_default_policy;
 use serde::Deserialize;
 use serde::Serialize;
 use serde::de;
@@ -140,12 +140,12 @@ pub enum Output {
     #[serde(rename = "forbidden")]
     Forbidden {
         reason: String,
-        cause: codex_execpolicy::Forbidden,
+        cause: llmx_execpolicy::Forbidden,
     },
 
     /// The safety of the command could not be verified.
     #[serde(rename = "unverified")]
-    Unverified { error: codex_execpolicy::Error },
+    Unverified { error: llmx_execpolicy::Error },
 }
 
 fn deserialize_from_json<'de, D>(deserializer: D) -> Result<ExecArg, D::Error>