fix: send GitHub webhook active flag as boolean (#25)

GitHub rejects webhook creation when gh api serializes active as a string. Use a typed field so gh sends a real boolean, and lock the gh/gosmee integration test harness to catch regressions.

lib/src/issue_tracker_client.dart

@@ -158,7 +158,7 @@ class IssueTrackerClient {
       _buildApiPath(repo, ['hooks']),
       '-f',
       'name=web',
-      '-f',
+      '-F',
       'active=true',
       '-f',
       'events[]=issues',

test/issue_assistant_app_run/github_gosmee_test.dart

@@ -145,7 +145,9 @@ projects:
       final ghLogLines = await ghLog.readAsLines();
       expect(
         ghLogLines.any(
-          (line) => line.contains('api -X POST repos/owner/sample/hooks'),
+          (line) =>
+              line.contains('api -X POST repos/owner/sample/hooks') &&
+              line.contains('-F active=true'),
         ),
         isTrue,
       );

test/test_support.dart

@@ -634,6 +634,22 @@ Future<void> writeGitHubGosmeeGhScript({
 
   buffer
     ..writeln('if [[ "\$1" == "api" && "\$4" == "repos/$repo/hooks" ]]; then')
+    ..writeln(r'''  active_flag=""''')
+    ..writeln(r'''  for ((i = 1; i <= $#; i += 1)); do''')
+    ..writeln(r'''    if [[ "${!i}" == "active=true" ]]; then''')
+    ..writeln(r'''      prev_index=$((i - 1))''')
+    ..writeln(r'''      active_flag="${!prev_index}"''')
+    ..writeln(r'''      break''')
+    ..writeln(r'''    fi''')
+    ..writeln(r'''  done''')
+    ..writeln(
+      r'''  if [[ "$active_flag" != "-F" && "$active_flag" != "--field" ]]; then''',
+    )
+    ..writeln(
+      r'''    echo "expected active=true to be sent with -F/--field, got: $*" >&2''',
+    )
+    ..writeln(r'''    exit 1''')
+    ..writeln(r'''  fi''')
     ..writeln("  cat <<'JSON'")
     ..writeln(jsonEncode({'id': webhookId}))
     ..writeln('JSON')