refactor(migration): rename Codex→OpenCode across the entire codebase

Phase 1 of the Codex-to-OpenCode migration. All lexical references to
"codex" in source code, error messages, config paths, test data, and
file names are renamed to "opencode". The default home directory changes
from `~/.codex/` to `~/.config/opencode/`. The daemon RPC module is
renamed from `rpc/codex.rs` to `rpc/opencode.rs`.

This is a surface-level rename only — the actual protocol, binary
spawning, and config format remain unchanged (Phases 2-3).

Author: STIFLEUR390

src-tauri/Cargo.lock

@@ -419,8 +419,8 @@ pub(crate) struct RequestContext {
 fn build_initialize_params(client_version: &str) -> Value {
     json!({
         "clientInfo": {
-            "name": "codex_monitor",
-            "title": "Codex Monitor",
+            "name": "opencode_monitor",
+            "title": "OpenCode Monitor",
             "version": client_version
         },
         "capabilities": {
@@ -560,7 +560,7 @@ impl WorkspaceSession {
     }
 }
 
-pub(crate) fn build_codex_path_env(opencode_bin: Option<&str>) -> Option<String> {
+pub(crate) fn build_opencode_path_env(opencode_bin: Option<&str>) -> Option<String> {
     let mut paths: Vec<PathBuf> = env::var_os("PATH")
         .map(|value| env::split_paths(&value).collect())
         .unwrap_or_default();
@@ -643,7 +643,7 @@ pub(crate) fn build_codex_path_env(opencode_bin: Option<&str>) -> Option<String>
         .map(|joined| joined.to_string_lossy().to_string())
 }
 
-pub(crate) fn build_codex_command_with_bin(
+pub(crate) fn build_opencode_command_with_bin(
     opencode_bin: Option<String>,
     opencode_args: Option<&str>,
     args: Vec<String>,
@@ -653,7 +653,7 @@ pub(crate) fn build_codex_command_with_bin(
         .filter(|value| !value.trim().is_empty())
         .unwrap_or_else(|| "opencode".into());
 
-    let path_env = build_codex_path_env(opencode_bin.as_deref());
+    let path_env = build_opencode_path_env(opencode_bin.as_deref());
     let mut command_args = parse_opencode_args(opencode_args)?;
     command_args.extend(args);
 
@@ -697,24 +697,24 @@ pub(crate) fn build_codex_command_with_bin(
     Ok(command)
 }
 
-pub(crate) async fn check_codex_installation(
+pub(crate) async fn check_opencode_installation(
     opencode_bin: Option<String>,
 ) -> Result<Option<String>, String> {
-    let mut command = build_codex_command_with_bin(opencode_bin, None, vec!["--version".to_string()])?;
+    let mut command = build_opencode_command_with_bin(opencode_bin, None, vec!["--version".to_string()])?;
     command.stdout(std::process::Stdio::piped());
     command.stderr(std::process::Stdio::piped());
 
     let output = match timeout(Duration::from_secs(5), command.output()).await {
         Ok(result) => result.map_err(|e| {
             if e.kind() == ErrorKind::NotFound {
-                "Codex CLI not found. Install Codex and ensure `codex` is on your PATH.".to_string()
+                "OpenCode CLI not found. Install OpenCode and ensure `opencode` is on your PATH.".to_string()
             } else {
                 e.to_string()
             }
         })?,
         Err(_) => {
             return Err(
-                "Timed out while checking Codex CLI. Make sure `codex --version` runs in Terminal."
+                "Timed out while checking OpenCode CLI. Make sure `opencode --version` runs in Terminal."
                     .to_string(),
             );
         }
@@ -730,11 +730,11 @@ pub(crate) async fn check_codex_installation(
         };
         if detail.is_empty() {
             return Err(
-                "Codex CLI failed to start. Try running `codex --version` in Terminal.".to_string(),
+                "OpenCode CLI failed to start. Try running `opencode --version` in Terminal.".to_string(),
             );
         }
         return Err(format!(
-            "Codex CLI failed to start: {detail}. Try running `codex --version` in Terminal."
+            "OpenCode CLI failed to start: {detail}. Try running `opencode --version` in Terminal."
         ));
     }
 
@@ -755,9 +755,9 @@ pub(crate) async fn spawn_workspace_session<E: EventSink>(
     event_sink: E,
 ) -> Result<Arc<WorkspaceSession>, String> {
     let opencode_bin = default_opencode_bin;
-    let _ = check_codex_installation(opencode_bin.clone()).await?;
+    let _ = check_opencode_installation(opencode_bin.clone()).await?;
 
-    let mut command = build_codex_command_with_bin(
+    let mut command = build_opencode_command_with_bin(
         opencode_bin,
         opencode_args.as_deref(),
         vec!["app-server".to_string()],
@@ -808,7 +808,7 @@ pub(crate) async fn spawn_workspace_session<E: EventSink>(
                     let payload = AppServerEvent {
                         workspace_id: fallback_workspace_id.clone(),
                         message: json!({
-                            "method": "codex/parseError",
+                            "method": "opencode/parseError",
                             "params": { "error": err.to_string(), "raw": line },
                         }),
                     };
@@ -1082,7 +1082,7 @@ pub(crate) async fn spawn_workspace_session<E: EventSink>(
             let mut child = session.child.lock().await;
             kill_child_process_tree(&mut child).await;
             return Err(
-                "Codex app-server did not respond to initialize. Check that `codex app-server` works in Terminal."
+                "OpenCode serve did not respond to initialize. Check that `opencode serve` works in Terminal."
                     .to_string(),
             );
         }
@@ -1241,17 +1241,17 @@ mod tests {
     #[test]
     fn resolve_workspace_for_cwd_normalizes_windows_paths() {
         let mut roots = HashMap::new();
-        roots.insert("ws-1".to_string(), normalize_root_path("C:\\Dev\\Codex"));
+        roots.insert("ws-1".to_string(), normalize_root_path("C:\\Dev\\OpenCode"));
         assert_eq!(
-            resolve_workspace_for_cwd("c:/dev/codex", &roots),
+            resolve_workspace_for_cwd("c:/dev/opencode", &roots),
             Some("ws-1".to_string())
         );
     }
 
     #[test]
     fn resolve_workspace_for_cwd_normalizes_windows_namespace_paths() {
         let mut roots = HashMap::new();
-        roots.insert("ws-1".to_string(), normalize_root_path("C:\\Dev\\Codex"));
+        roots.insert("ws-1".to_string(), normalize_root_path("C:\\Dev\\OpenCode"));
         assert_eq!(
             resolve_workspace_for_cwd("\\\\?\\C:\\Dev\\Codex", &roots),
             Some("ws-1".to_string())
@@ -1269,23 +1269,23 @@ mod tests {
     #[test]
     fn resolve_workspace_for_cwd_matches_nested_paths() {
         let mut roots = HashMap::new();
-        roots.insert("ws-1".to_string(), normalize_root_path("/tmp/codex"));
+        roots.insert("ws-1".to_string(), normalize_root_path("/tmp/opencode"));
         assert_eq!(
-            resolve_workspace_for_cwd("/tmp/codex/subdir/project", &roots),
+            resolve_workspace_for_cwd("/tmp/opencode/subdir/project", &roots),
             Some("ws-1".to_string())
         );
     }
 
     #[test]
     fn resolve_workspace_for_cwd_prefers_longest_matching_root() {
         let mut roots = HashMap::new();
-        roots.insert("ws-parent".to_string(), normalize_root_path("/tmp/codex"));
+        roots.insert("ws-parent".to_string(), normalize_root_path("/tmp/opencode"));
         roots.insert(
             "ws-child".to_string(),
-            normalize_root_path("/tmp/codex/subdir"),
+            normalize_root_path("/tmp/opencode/subdir"),
         );
         assert_eq!(
-            resolve_workspace_for_cwd("/tmp/codex/subdir/project", &roots),
+            resolve_workspace_for_cwd("/tmp/opencode/subdir/project", &roots),
             Some("ws-child".to_string())
         );
     }

src-tauri/src/backend/app_server.rs

@@ -1,11 +1,11 @@
 #[allow(dead_code)]
 #[path = "../backend/mod.rs"]
 mod backend;
-#[path = "../codex/args.rs"]
+#[path = "../opencode/args.rs"]
 mod opencode_args;
-#[path = "../codex/config.rs"]
+#[path = "../opencode/config.rs"]
 mod opencode_config;
-#[path = "../codex/home.rs"]
+#[path = "../opencode/home.rs"]
 mod opencode_home;
 #[path = "../files/io.rs"]
 mod file_io;
@@ -41,7 +41,7 @@ mod opencode {
         pub(crate) use crate::opencode_args::*;
     }
     pub(crate) mod config {
-        pub(crate) use crate::codex_config::*;
+        pub(crate) use crate::opencode_config::*;
     }
     pub(crate) mod home {
         pub(crate) use crate::opencode_home::*;
@@ -593,7 +593,7 @@ impl DaemonState {
         feature_key: String,
         enabled: bool,
     ) -> Result<(), String> {
-        codex_config::write_feature_enabled(feature_key.as_str(), enabled)
+        opencode_config::write_feature_enabled(feature_key.as_str(), enabled)
     }
 
     async fn get_agents_settings(&self) -> Result<agents_config_core::AgentsSettingsDto, String> {
@@ -1499,7 +1499,7 @@ fn default_data_dir() -> PathBuf {
 fn usage() -> String {
     format!(
         "\
-USAGE:\n  codex-monitor-daemon [--listen <addr>] [--data-dir <path>] [--token <token> | --insecure-no-auth]\n\n\
+USAGE:\n  opencode-monitor-daemon [--listen <addr>] [--data-dir <path>] [--token <token> | --insecure-no-auth]\n\n\
 OPTIONS:\n  --listen <addr>          Bind address (default: {DEFAULT_LISTEN_ADDR})\n  --data-dir <path>        Data dir holding workspaces.json/settings.json\n  --token <token>          Shared token required by TCP clients\n  --insecure-no-auth       Disable TCP auth (dev only)\n  -h, --help               Show this help\n"
     )
 }
@@ -1596,7 +1596,7 @@ mod tests {
             .expect("time")
             .as_nanos();
         let dir = std::env::temp_dir().join(format!(
-            "codex-monitor-{prefix}-{}-{unique}",
+            "opencode-monitor-{prefix}-{}-{unique}",
             std::process::id()
         ));
         std::fs::create_dir_all(&dir).expect("create temp dir");
@@ -1614,7 +1614,7 @@ mod tests {
             app_settings: Mutex::new(AppSettings::default()),
             event_sink: DaemonEventSink { tx },
             opencode_login_cancels: Mutex::new(HashMap::new()),
-            daemon_binary_path: Some("/tmp/codex-monitor-daemon".to_string()),
+            daemon_binary_path: Some("/tmp/opencode-monitor-daemon".to_string()),
         }
     }
 
@@ -1940,7 +1940,7 @@ fn main() {
             }
         };
         eprintln!(
-            "codex-monitor-daemon listening on {} (data dir: {})",
+            "opencode-monitor-daemon listening on {} (data dir: {})",
             config.listen,
             state
                 .storage_path

src-tauri/src/bin/opencode_monitor_daemon.rs

@@ -1,6 +1,6 @@
 use super::*;
 
-#[path = "rpc/codex.rs"]
+#[path = "rpc/opencode.rs"]
 mod opencode;
 #[path = "rpc/daemon.rs"]
 mod daemon;

src-tauri/src/bin/opencode_monitor_daemon/rpc.rs

@@ -14,7 +14,7 @@ pub(super) async fn dispatch_rpc_request(
         return result;
     }
 
-    if let Some(result) = codex::try_handle(state, method, params).await {
+    if let Some(result) = opencode::try_handle(state, method, params).await {
         return result;
     }
 

src-tauri/src/bin/opencode_monitor_daemon/rpc/dispatcher.rs

@@ -27,7 +27,7 @@ const EXPECTED_DAEMON_MODE: &str = "tcp";
 const CURRENT_APP_VERSION: &str = env!("CARGO_PKG_VERSION");
 const DEFAULT_LISTEN_ADDR: &str = "0.0.0.0:4732";
 const REMOTE_TOKEN_PLACEHOLDER: &str = "<remote-backend-token>";
-const APP_IDENTIFIER: &str = "com.dimillian.codexmonitor";
+const APP_IDENTIFIER: &str = "com.dimillian.opencode-monitor";
 const DAEMON_RPC_TIMEOUT: Duration = Duration::from_millis(700);
 
 #[derive(Debug, Clone)]
@@ -236,9 +236,9 @@ fn parse_args() -> Result<CliArgs, String> {
 fn usage() -> String {
     format!(
         "\
-USAGE:\n  codex-monitor-daemonctl <command> [options]\n\n\
+USAGE:\n  opencode-monitor-daemonctl <command> [options]\n\n\
 COMMANDS:\n  start              Start daemon (auto-restarts mismatched daemon if safe)\n  stop               Stop daemon\n  status             Show daemon status\n  command-preview    Print equivalent daemon start command\n\n\
-OPTIONS:\n  --listen <addr>        Bind/listen address (default derived from settings, fallback: {DEFAULT_LISTEN_ADDR})\n  --token <token>        Remote backend token override\n  --data-dir <path>      App data dir (contains settings.json/workspaces.json)\n  --daemon-path <path>   Explicit path to codex-monitor-daemon binary\n  --insecure-no-auth     Start/probe daemon without auth token (dev only)\n  --json                 Print JSON output\n  -h, --help             Show this help\n\n\
+OPTIONS:\n  --listen <addr>        Bind/listen address (default derived from settings, fallback: {DEFAULT_LISTEN_ADDR})\n  --token <token>        Remote backend token override\n  --data-dir <path>      App data dir (contains settings.json/workspaces.json)\n  --daemon-path <path>   Explicit path to opencode-monitor-daemon binary\n  --insecure-no-auth     Start/probe daemon without auth token (dev only)\n  --json                 Print JSON output\n  -h, --help             Show this help\n\n\
 NOTES:\n  - Defaults read token/host from <data-dir>/settings.json\n  - If no --data-dir is provided, default app data dir is used for this platform\n"
     )
 }
@@ -1379,7 +1379,7 @@ mod tests {
     #[test]
     fn parses_pid_from_ss_output() {
         let output = r#"State  Recv-Q Send-Q Local Address:Port Peer Address:PortProcess
-LISTEN 0      4096   0.0.0.0:4732      0.0.0.0:*    users:(("codex-monitor-da",pid=12345,fd=7))
+LISTEN 0      4096   0.0.0.0:4732      0.0.0.0:*    users:(("opencode-monitor-da",pid=12345,fd=7))
 "#;
         assert_eq!(parse_ss_listener_pid(output, 4732), Some(12345));
         assert_eq!(parse_ss_listener_pid(output, 9000), None);
@@ -1389,7 +1389,7 @@ LISTEN 0      4096   0.0.0.0:4732      0.0.0.0:*    users:(("codex-monitor-da",p
     fn parses_pid_from_netstat_output() {
         let output = r#"Active Internet connections (only servers)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
-tcp        0      0 0.0.0.0:4732            0.0.0.0:*               LISTEN      6789/codex-monitor-da
+tcp        0      0 0.0.0.0:4732            0.0.0.0:*               LISTEN      6789/opencode-monitor-da
 "#;
         assert_eq!(parse_netstat_listener_pid(output, 4732), Some(6789));
         assert_eq!(parse_netstat_listener_pid(output, 9000), None);