Git identity from the settings for all agent shells, terminals and the git panel

Set GIT_AUTHOR_*/GIT_COMMITTER_* from Settings → Account → Git (also inside the
sandbox), so a repository's own user.name/user.email no longer wins; tell agents
not to change the git identity.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/src/git.rs

@@ -44,6 +44,8 @@ tokio::task_local! {
     static SANDBOX: Option<crate::sandbox::SandboxSpec>;
     /// The user's git config (credentials, identity) for unsandboxed runs.
     static GITCONFIG: Option<std::path::PathBuf>;
+    /// The user's commit identity (overrides a repository's own user.name/email).
+    static GITENV: Vec<(String, String)>;
 }
 
 async fn git(dir: &Path, args: &[&str], timeout: u64) -> Result<Out, ApiError> {
@@ -63,6 +65,7 @@ async fn git(dir: &Path, args: &[&str], timeout: u64) -> Result<Out, ApiError> {
             if let Some(cfg) = GITCONFIG.try_with(|g| g.clone()).ok().flatten() {
                 c.env("GIT_CONFIG_GLOBAL", cfg);
             }
+            c.envs(GITENV.try_with(|e| e.clone()).unwrap_or_default());
             c
         }
     };
@@ -171,7 +174,8 @@ fn parse_status(raw: &str) -> Value {
 pub async fn handle(Extension(user): Extension<User>, State(app): State<AppState>, Json(b): Json<GitBody>) -> ApiResult {
     let spec = crate::sandbox::spec_for(&app, Some(&user.id));
     let cfg = crate::gitcreds::global_config(&app, &user);
-    SANDBOX.scope(spec, GITCONFIG.scope(cfg, handle_inner(user, app, b))).await
+    let env = crate::gitcreds::identity_env(&app, &user.id);
+    SANDBOX.scope(spec, GITCONFIG.scope(cfg, GITENV.scope(env, handle_inner(user, app, b)))).await
 }
 
 async fn handle_inner(user: User, app: AppState, b: GitBody) -> ApiResult {
@@ -388,8 +392,9 @@ fn wt_str<'a>(wt: &'a Value, key: &str) -> &'a str {
 pub async fn worktree(app: &std::sync::Arc<App>, user: &User, session: &mut crate::types::Session, action: &str) -> Result<Value, ApiError> {
     let spec = crate::sandbox::spec_for(app, Some(&user.id));
     let cfg = crate::gitcreds::global_config(app, user);
+    let env = crate::gitcreds::identity_env(app, &user.id);
     let s = session.clone();
-    let res = SANDBOX.scope(spec, GITCONFIG.scope(cfg, worktree_inner(s, action))).await?;
+    let res = SANDBOX.scope(spec, GITCONFIG.scope(cfg, GITENV.scope(env, worktree_inner(s, action)))).await?;
     if let Some(cwd) = res.get("cwd").and_then(|v| v.as_str()) {
         session.cwd = cwd.to_string();
     }