fix(lint): resolve golangci-lint errors for clean CI

Fixes 5 linting issues to allow PR checks to pass:
1. hooks.go: Explicitly ignore error in async goroutine
2. 022_drop_edge_columns.go: Handle deferred PRAGMA error
3. flags.go: Add nosec comment for validated file path
4. create_form.go: Fix American spelling (canceled vs cancelled)
5. create_form.go: Explicitly mark cmd parameter as required by cobra
These are pre-existing issues in the codebase, fixed here to
enable clean CI for the import deduplication fix.
🤖 Generated with Claude Code

cmd/bd/flags.go

@@ -94,6 +94,7 @@ func readBodyFile(filePath string) (string, error) {
 	if filePath == "-" {
 		reader = os.Stdin
 	} else {
+		// #nosec G304 - filePath comes from user flag, validated by caller
 		file, err := os.Open(filePath)
 		if err != nil {
 			return "", fmt.Errorf("failed to open file: %w", err)