Add Auto/Review mode toggle and non-interactive runner

- GUI: Auto/Review toggle on TaskDetail and ProjectView
  persisted per-project in localStorage
- Runner: noninteractive param (stdin=DEVNULL, 300s timeout)
  activated by KIN_NONINTERACTIVE=1 env or param
- CLI: --allow-write flag for kin run command
- API: POST /run accepts {allow_write: bool}, sets
  KIN_NONINTERACTIVE=1 and stdin=DEVNULL for subprocess
- Fixes pipeline hanging on interactive claude input (VDOL-002)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/api.py

@@ -276,8 +276,12 @@ def is_task_running(task_id: str):
     return {"running": False}
 
 
+class TaskRun(BaseModel):
+    allow_write: bool = False
+
+
 @app.post("/api/tasks/{task_id}/run")
-def run_task(task_id: str):
+def run_task(task_id: str, body: TaskRun | None = None):
     """Launch pipeline for a task in background. Returns 202."""
     conn = get_conn()
     t = models.get_task(conn, task_id)
@@ -289,12 +293,22 @@ def run_task(task_id: str):
     conn.close()
     # Launch kin run in background subprocess
     kin_root = Path(__file__).parent.parent
+    cmd = [sys.executable, "-m", "cli.main", "--db", str(DB_PATH),
+           "run", task_id]
+    if body and body.allow_write:
+        cmd.append("--allow-write")
+
+    import os
+    env = os.environ.copy()
+    env["KIN_NONINTERACTIVE"] = "1"
+
     try:
         proc = subprocess.Popen(
-            [sys.executable, "-m", "cli.main", "--db", str(DB_PATH),
-             "run", task_id],
+            cmd,
             cwd=str(kin_root),
             stdout=subprocess.DEVNULL,
+            stdin=subprocess.DEVNULL,
+            env=env,
         )
         import logging
         logging.getLogger("kin").info(f"Pipeline started for {task_id}, pid={proc.pid}")