fix: cancel blocked tasks + auto-complete completion reports

Two fixes for BLOCKED task issues:

1. Allow BLOCKED → CANCELLED state transition so users can cancel tasks
   stuck waiting for input. Adds Cancel button to BLOCKED task cards in
   the UI alongside the question/answer controls.

2. Detect when agents write completion reports to $CLAUDOMATOR_QUESTION_FILE
   instead of real questions. If the question JSON has no options and no "?"
   in the text, treat it as a summary (stored on the execution) and fall
   through to normal completion + sandbox teardown rather than blocking.
   Also tightened the preamble to make the distinction explicit.

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

1 files changed, 43 insertions, 1 deletions

diff --git a/internal/executor/claude_test.go b/internal/executor/claude_test.go
index b5f7962..36affef 100644
--- a/internal/executor/claude_test.go
+++ b/internal/executor/claude_test.go
@@ -494,7 +494,7 @@ func TestBlockedError_IncludesSandboxDir(t *testing.T) {
 	scriptPath := filepath.Join(t.TempDir(), "fake-claude.sh")
 	if err := os.WriteFile(scriptPath, []byte(`#!/bin/sh
 if [ -n "$CLAUDOMATOR_QUESTION_FILE" ]; then
-  printf '{"question":"continue?"}' > "$CLAUDOMATOR_QUESTION_FILE"
+  printf '{"text":"Should I continue?"}' > "$CLAUDOMATOR_QUESTION_FILE"
 fi
 `), 0755); err != nil {
 		t.Fatalf("write script: %v", err)
@@ -578,3 +578,45 @@ func TestClaudeRunner_Run_ResumeUsesStoredSandboxDir(t *testing.T) {
 		t.Errorf("resume working dir: want %q, got %q", sandboxDir, string(got))
 	}
 }
+
+func TestIsCompletionReport(t *testing.T) {
+	tests := []struct {
+		name     string
+		json     string
+		expected bool
+	}{
+		{
+			name:     "real question with options",
+			json:     `{"text": "Should I proceed with implementation?", "options": ["Yes", "No"]}`,
+			expected: false,
+		},
+		{
+			name:     "real question no options",
+			json:     `{"text": "Which approach do you prefer?"}`,
+			expected: false,
+		},
+		{
+			name:     "completion report no options no question mark",
+			json:     `{"text": "All tests pass. Implementation complete. Summary written to CLAUDOMATOR_SUMMARY_FILE."}`,
+			expected: true,
+		},
+		{
+			name:     "completion report with empty options",
+			json:     `{"text": "Feature implemented and committed.", "options": []}`,
+			expected: true,
+		},
+		{
+			name:     "invalid json treated as not a report",
+			json:     `not json`,
+			expected: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := isCompletionReport(tt.json)
+			if got != tt.expected {
+				t.Errorf("isCompletionReport(%q) = %v, want %v", tt.json, got, tt.expected)
+			}
+		})
+	}
+}