Add custom types for type safety throughout codebase

- Add FileCount, FileSize, RelFilePath, AbsFilePath, ModTime, Multihash types
- Add UnixSeconds and UnixNanos types for timestamp handling
- Add URL types (ManifestURL, FileURL, BaseURL) with safe path joining
- Consolidate scanner package into mfer package
- Update checker to use custom types in Result and CheckStatus
- Add ModTime.Timestamp() method for protobuf conversion
- Update all tests to use proper custom types

internal/cli/freshen.go

@@ -113,7 +113,7 @@ func (mfa *CLIApp) freshenManifestOperation(ctx *cli.Context) error {
 		}
 
 		// Handle dotfiles
-		if !includeDotfiles && pathIsHidden(relPath) {
+		if !includeDotfiles && mfer.IsHiddenPath(filepath.ToSlash(relPath)) {
 			if info.IsDir() {
 				return filepath.SkipDir
 			}
@@ -274,10 +274,14 @@ func (mfa *CLIApp) freshenManifestOperation(ctx *cli.Context) error {
 			hashedFiles++
 
 			// Add to builder with computed hash
-			addFileToBuilder(builder, e.path, e.size, e.mtime, hash)
+			if err := addFileToBuilder(builder, e.path, e.size, e.mtime, hash); err != nil {
+				return fmt.Errorf("failed to add %s: %w", e.path, err)
+			}
 		} else {
 			// Use existing entry
-			addExistingToBuilder(builder, e.existing)
+			if err := addExistingToBuilder(builder, e.existing); err != nil {
+				return fmt.Errorf("failed to add %s: %w", e.path, err)
+			}
 		}
 	}
 
@@ -360,38 +364,15 @@ func hashFile(r io.Reader, size int64, progress func(int64)) ([]byte, int64, err
 }
 
 // addFileToBuilder adds a new file entry to the builder
-func addFileToBuilder(b *mfer.Builder, path string, size int64, mtime time.Time, hash []byte) {
-	// Use the builder's internal method indirectly by creating an entry
-	// Since Builder.AddFile reads from a reader, we need to use a different approach
-	// We'll access the builder's files directly through a custom method
-	b.AddFileWithHash(path, size, mtime, hash)
+func addFileToBuilder(b *mfer.Builder, path string, size int64, mtime time.Time, hash []byte) error {
+	return b.AddFileWithHash(mfer.RelFilePath(path), mfer.FileSize(size), mfer.ModTime(mtime), hash)
 }
 
 // addExistingToBuilder adds an existing manifest entry to the builder
-func addExistingToBuilder(b *mfer.Builder, entry *mfer.MFFilePath) {
+func addExistingToBuilder(b *mfer.Builder, entry *mfer.MFFilePath) error {
 	mtime := time.Unix(entry.Mtime.Seconds, int64(entry.Mtime.Nanos))
-	if len(entry.Hashes) > 0 {
-		b.AddFileWithHash(entry.Path, entry.Size, mtime, entry.Hashes[0].MultiHash)
+	if len(entry.Hashes) == 0 {
+		return nil
 	}
-}
-
-// pathIsHidden checks if a path contains hidden components
-func pathIsHidden(p string) bool {
-	// "." is not hidden, it's the current directory
-	if p == "." {
-		return false
-	}
-	// Check each path component
-	for p != "" && p != "." && p != "/" {
-		base := filepath.Base(p)
-		if len(base) > 0 && base[0] == '.' {
-			return true
-		}
-		parent := filepath.Dir(p)
-		if parent == p {
-			break
-		}
-		p = parent
-	}
-	return false
+	return b.AddFileWithHash(mfer.RelFilePath(entry.Path), mfer.FileSize(entry.Size), mfer.ModTime(mtime), entry.Hashes[0].MultiHash)
 }

internal/cli/gen.go

@@ -13,29 +13,29 @@ import (
 	"github.com/spf13/afero"
 	"github.com/urfave/cli/v2"
 	"sneak.berlin/go/mfer/internal/log"
-	"sneak.berlin/go/mfer/internal/scanner"
+	"sneak.berlin/go/mfer/mfer"
 )
 
 func (mfa *CLIApp) generateManifestOperation(ctx *cli.Context) error {
 	log.Debug("generateManifestOperation()")
 
-	opts := &scanner.Options{
+	opts := &mfer.ScannerOptions{
 		IncludeDotfiles: ctx.Bool("IncludeDotfiles"),
 		FollowSymLinks:  ctx.Bool("FollowSymLinks"),
 		Fs:              mfa.Fs,
 	}
 
-	s := scanner.NewWithOptions(opts)
+	s := mfer.NewScannerWithOptions(opts)
 
 	// Phase 1: Enumeration - collect paths and stat files
 	args := ctx.Args()
 	showProgress := ctx.Bool("progress")
 
 	// Set up enumeration progress reporting
-	var enumProgress chan scanner.EnumerateStatus
+	var enumProgress chan mfer.EnumerateStatus
 	var enumWg sync.WaitGroup
 	if showProgress {
-		enumProgress = make(chan scanner.EnumerateStatus, 1)
+		enumProgress = make(chan mfer.EnumerateStatus, 1)
 		enumWg.Add(1)
 		go func() {
 			defer enumWg.Done()
@@ -117,10 +117,10 @@ func (mfa *CLIApp) generateManifestOperation(ctx *cli.Context) error {
 	}()
 
 	// Phase 2: Scan - read file contents and generate manifest
-	var scanProgress chan scanner.ScanStatus
+	var scanProgress chan mfer.ScanStatus
 	var scanWg sync.WaitGroup
 	if showProgress {
-		scanProgress = make(chan scanner.ScanStatus, 1)
+		scanProgress = make(chan mfer.ScanStatus, 1)
 		scanWg.Add(1)
 		go func() {
 			defer scanWg.Done()