Complete comprehensive Codex → LLMX branding update

Fixed all remaining user-facing "Codex" references across entire codebase:
- Updated all UI strings and error messages
- Fixed GitHub issue templates and workflows
- Updated MCP server tool descriptions and error messages
- Fixed all test messages and comments
- Updated documentation comments
- Changed auth keyring service name to "LLMX Auth"

Reduced from 201 occurrences to only code identifiers (struct/type names).
Changes span 78 files across Rust, Python, YAML, and JSON.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

llmx-rs/rmcp-client/src/bin/test_stdio_server.rs

@@ -103,7 +103,7 @@ impl TestToolServer {
         let raw = RawResourceTemplate {
             uri_template: "memo://codex/{slug}".to_string(),
             name: "codex-memo".to_string(),
-            title: Some("Codex Memo".to_string()),
+            title: Some("LLMX Memo".to_string()),
             description: Some(
                 "Template for memo://codex/{slug} resources used in tests.".to_string(),
             ),

llmx-rs/rmcp-client/src/bin/test_streamable_http_server.rs

@@ -100,7 +100,7 @@ impl TestToolServer {
         let raw = RawResourceTemplate {
             uri_template: "memo://codex/{slug}".to_string(),
             name: "codex-memo".to_string(),
-            title: Some("Codex Memo".to_string()),
+            title: Some("LLMX Memo".to_string()),
             description: Some(
                 "Template for memo://codex/{slug} resources used in tests.".to_string(),
             ),

llmx-rs/rmcp-client/src/oauth.rs

@@ -49,7 +49,7 @@ use tokio::sync::Mutex;
 
 use crate::find_llmx_home::find_llmx_home;
 
-const KEYRING_SERVICE: &str = "Codex MCP Credentials";
+const KEYRING_SERVICE: &str = "LLMX MCP Credentials";
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct StoredOAuthTokens {

llmx-rs/rmcp-client/src/perform_oauth_login.rs

@@ -64,7 +64,7 @@ pub async fn perform_oauth_login(
     let mut oauth_state = OAuthState::new(server_url, Some(http_client)).await?;
     let scope_refs: Vec<&str> = scopes.iter().map(String::as_str).collect();
     oauth_state
-        .start_authorization(&scope_refs, &redirect_uri, Some("Codex"))
+        .start_authorization(&scope_refs, &redirect_uri, Some("LLMX"))
         .await?;
     let auth_url = oauth_state.get_authorization_url().await?;
 

llmx-rs/rmcp-client/tests/resources.rs

@@ -36,7 +36,7 @@ fn init_params() -> InitializeRequestParams {
         client_info: Implementation {
             name: "codex-test".into(),
             version: "0.0.0-test".into(),
-            title: Some("Codex rmcp resource test".into()),
+            title: Some("LLMX rmcp resource test".into()),
             user_agent: None,
         },
         protocol_version: mcp_types::MCP_SCHEMA_VERSION.to_string(),
@@ -92,7 +92,7 @@ async fn rmcp_client_can_list_and_read_resources() -> anyhow::Result<()> {
                 ),
                 mime_type: Some("text/plain".to_string()),
                 name: "codex-memo".to_string(),
-                title: Some("Codex Memo".to_string()),
+                title: Some("LLMX Memo".to_string()),
                 uri_template: "memo://codex/{slug}".to_string(),
             }],
         }