P6 plan: asynchronous batch fetch endpoint — phase spec, task plan, given tests

Co-Authored-By: DeepSeek V4 Pro <noreply@deepseek.com>

docs/plans/p6/_files/cmd_sift/batch_test.go

@@ -0,0 +1,34 @@
+package main
+
+import "testing"
+
+func TestParseBatchArgs(t *testing.T) {
+	cases := []struct {
+		args []string
+		verb string
+		arg  string
+		ok   bool
+	}{
+		{[]string{"submit", "targets.json"}, "submit", "targets.json", true},
+		{[]string{"submit", "-"}, "submit", "-", true},
+		{[]string{"status", "job-123"}, "status", "job-123", true},
+		{[]string{"cancel", "job-123"}, "cancel", "job-123", true},
+		{[]string{}, "", "", false},
+		{[]string{"status"}, "", "", false},
+		{[]string{"status", "a", "b"}, "", "", false},
+		{[]string{"bogus", "x"}, "", "", false},
+	}
+	for _, c := range cases {
+		verb, arg, err := parseBatchArgs(c.args)
+		if c.ok {
+			if err != nil {
+				t.Fatalf("%v: unexpected error %v", c.args, err)
+			}
+			if verb != c.verb || arg != c.arg {
+				t.Fatalf("%v: got verb=%q arg=%q", c.args, verb, arg)
+			}
+		} else if err == nil {
+			t.Fatalf("%v: want error", c.args)
+		}
+	}
+}