feat: add .shushignore support for flexible file exclusion

- Add .shushignore file support (project root + global ~/.config/.shushignore)
- Support gitignore-style patterns: wildcards (*), directories (dir/), negation (\!pattern)
- Universal integration: works with all processing modes (files, directories, git-aware)
- Smart messaging: explicit ignore messages for direct file access
- Silent skipping: directory traversal automatically skips ignored files
- Enhanced verbose output: distinguishes between ignored vs unsupported files
- Pattern examples: *.tmp, build/, test*.js, \!important.js

internal/processor/git_processor.go

@@ -63,7 +63,11 @@ func (p *Processor) processGitChanges() error {
 		if IsSupportedFile(change.Path) {
 			supportedChanges = append(supportedChanges, change)
 		} else if p.cli.Verbose {
-			fmt.Printf("Skipping unsupported file: %s\n", change.Path)
+			if IsIgnored(change.Path) {
+				fmt.Printf("Skipping ignored file: %s\n", change.Path)
+			} else {
+				fmt.Printf("Skipping unsupported file: %s\n", change.Path)
+			}
 		}
 	}
 

internal/processor/languages.go

@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/carlosarraes/shush/internal/ignore"
 	"github.com/carlosarraes/shush/internal/types"
 )
 
@@ -152,5 +153,17 @@ func IsSupportedFile(filename string) bool {
 	}
 	ext = strings.TrimPrefix(ext, ".")
 	_, ok := languageMap[ext]
-	return ok
+	if !ok {
+		return false
+	}
+
+	return !IsIgnored(filename)
+}
+
+func IsIgnored(filename string) bool {
+	ignoreChecker, err := ignore.Load()
+	if err != nil {
+		return false
+	}
+	return ignoreChecker.IsIgnored(filename)
 }

internal/processor/processor.go

@@ -40,6 +40,11 @@ func (p *Processor) Process() error {
 		return p.processDirectory(p.cli.Path)
 	}
 
+	if IsIgnored(p.cli.Path) {
+		fmt.Printf("File %s is in .shushignore, ignoring\n", p.cli.Path)
+		return nil
+	}
+
 	return p.processFile(p.cli.Path)
 }