fix(lint): Add nolint directive for GitHub API spelling

The misspell linter flags "cancelled" but this is the actual value
returned by GitHub's Check Runs API (British spelling). Added nolint
directive with explanation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/web/fetcher.go

@@ -513,7 +513,7 @@ func determineCIStatus(checks []struct {
 	for _, check := range checks {
 		// Check conclusion first (for completed checks)
 		switch check.Conclusion {
-		case "failure", "cancelled", "timed_out", "action_required":
+		case "failure", "cancelled", "timed_out", "action_required": //nolint:misspell // GitHub API returns "cancelled" (British spelling)
 			hasFailure = true
 		case "success", "skipped", "neutral":
 			// Pass