feat: remove agent_working_dir from settings (#1874)

* remove configurable agent_working_dir

(cherry picked from commit 285b3e04abceeb8e4a4ee1be16e3de97a8f32299)

* calculate agent_working_dir on create and start task

* i18n

crates/server/src/routes/task_attempts.rs

@@ -176,16 +176,17 @@ pub async fn create_task_attempt(
         .await?
         .ok_or(SqlxError::RowNotFound)?;
 
-    let project = task
-        .parent_project(pool)
-        .await?
-        .ok_or(SqlxError::RowNotFound)?;
-
-    let agent_working_dir = project
-        .default_agent_working_dir
-        .as_ref()
-        .filter(|dir| !dir.is_empty())
-        .cloned();
+    // Compute agent_working_dir based on repo count:
+    // - Single repo: use repo name as working dir (agent runs in repo directory)
+    // - Multiple repos: use None (agent runs in workspace root)
+    let agent_working_dir = if payload.repos.len() == 1 {
+        let repo = Repo::find_by_id(pool, payload.repos[0].repo_id)
+            .await?
+            .ok_or(RepoError::NotFound)?;
+        Some(repo.name)
+    } else {
+        None
+    };
 
     let attempt_id = Uuid::new_v4();
     let git_branch_name = deployment

crates/server/src/routes/tasks.rs

@@ -14,8 +14,7 @@ use axum::{
 };
 use db::models::{
     image::TaskImage,
-    project::{Project, ProjectError},
-    repo::Repo,
+    repo::{Repo, RepoError},
     task::{CreateTask, Task, TaskWithAttemptStatus, UpdateTask},
     workspace::{CreateWorkspace, Workspace},
     workspace_repo::{CreateWorkspaceRepo, WorkspaceRepo},
@@ -178,21 +177,23 @@ pub async fn create_task_and_start(
         )
         .await;
 
-    let project = Project::find_by_id(pool, task.project_id)
-        .await?
-        .ok_or(ProjectError::ProjectNotFound)?;
-
     let attempt_id = Uuid::new_v4();
     let git_branch_name = deployment
         .container()
         .git_branch_from_workspace(&attempt_id, &task.title)
         .await;
 
-    let agent_working_dir = project
-        .default_agent_working_dir
-        .as_ref()
-        .filter(|dir: &&String| !dir.is_empty())
-        .cloned();
+    // Compute agent_working_dir based on repo count:
+    // - Single repo: use repo name as working dir (agent runs in repo directory)
+    // - Multiple repos: use None (agent runs in workspace root)
+    let agent_working_dir = if payload.repos.len() == 1 {
+        let repo = Repo::find_by_id(pool, payload.repos[0].repo_id)
+            .await?
+            .ok_or(RepoError::NotFound)?;
+        Some(repo.name)
+    } else {
+        None
+    };
 
     let workspace = Workspace::create(
         pool,