fix: resolve golangci-lint errors

- Add _ = prefix for ignored Close/Remove return values
- Fix unused cmd parameter in runMoleculeReady
- Add nolint:misspell for intentional British "cancelled" spelling
- Update comments to use US spelling where not intentional

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

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

cmd/bd/doctor/fix/maintenance.go

@@ -126,7 +126,7 @@ func ExpiredTombstones(path string) error {
 		issue.SetDefaults()
 		allIssues = append(allIssues, &issue)
 	}
-	file.Close()
+	_ = file.Close()
 
 	ttl := types.DefaultTombstoneTTL
 
@@ -156,16 +156,16 @@ func ExpiredTombstones(path string) error {
 	encoder := json.NewEncoder(tempFile)
 	for _, issue := range kept {
 		if err := encoder.Encode(issue); err != nil {
-			tempFile.Close()
+			_ = tempFile.Close()
-			os.Remove(tempPath)
+			_ = os.Remove(tempPath)
 			return fmt.Errorf("failed to write issue %s: %w", issue.ID, err)
 		}
 	}
-	tempFile.Close()
+	_ = tempFile.Close()
 
 	// Atomically replace
 	if err := os.Rename(tempPath, jsonlPath); err != nil {
-		os.Remove(tempPath)
+		_ = os.Remove(tempPath)
 		return fmt.Errorf("failed to replace issues.jsonl: %w", err)
 	}
 

cmd/bd/ready.go

@@ -268,7 +268,7 @@ var blockedCmd = &cobra.Command{
 }
 
 // runMoleculeReady shows ready steps within a specific molecule
-func runMoleculeReady(cmd *cobra.Command, molIDArg string) {
+func runMoleculeReady(_ *cobra.Command, molIDArg string) {
 	ctx := rootCtx
 
 	// Molecule-ready requires direct store access for subgraph loading

internal/storage/sqlite/blocked_cache.go

@@ -20,7 +20,7 @@
 // Gate types: "all-children" (default, blocked until ALL close) or "any-children" (until ANY closes).
 //
 // Conditional blocks (bd-kzda): B runs only if A fails. B is blocked until A is closed
-// with a failure close reason (failed, rejected, wontfix, cancelled, abandoned, etc.).
+// with a failure close reason (failed, rejected, wontfix, canceled, abandoned, etc.).
 // If A succeeds (closed without failure), B stays blocked.
 //
 // The cache is maintained automatically by invalidating and rebuilding whenever:
@@ -132,7 +132,7 @@ func (s *SQLiteStorage) rebuildBlockedCache(ctx context.Context, exec execer) er
 	// - 'parent-child': Propagates blockage to children
 	//
 	// Failure close reasons are detected by matching keywords in close_reason:
-	// failed, rejected, wontfix, won't fix, cancelled, canceled, abandoned,
+	// failed, rejected, wontfix, won't fix, canceled, abandoned,
 	// blocked, error, timeout, aborted
 	query := `
 		INSERT INTO blocked_issues_cache (issue_id)

internal/types/types.go

@@ -434,8 +434,8 @@ var FailureCloseKeywords = []string{
 	"rejected",
 	"wontfix",
 	"won't fix",
-	"cancelled",
 	"canceled",
+	"cancelled", //nolint:misspell // British spelling intentionally included
 	"abandoned",
 	"blocked",
 	"error",