fix: improve git walking termination and error handling in changelog generator

## CHANGES

- Add storer import for proper git iteration control
- Use storer.ErrStop instead of nil for commit iteration termination
- Handle storer.ErrStop as expected condition in git walker
- Update cache comment to clarify Unreleased version skipping
- Change custom patterns warning to stderr output
- Add storer to VSCode spell checker dictionary

.vscode/settings.json

@@ -99,6 +99,7 @@
 		"seaborn",
 		"semgrep",
 		"sess",
+		"storer",
 		"Streamlit",
 		"stretchr",
 		"talkpanel",

cmd/generate_changelog/internal/changelog/generator.go

@@ -131,7 +131,7 @@ func (g *Generator) collectData() error {
 					// Save any new versions to cache (after potential AI processing)
 					if currentTag != cachedTag {
 						for _, version := range g.versions {
-							// Skip versions that were already cached
+							// Skip versions that were already cached and Unreleased
 							if version.Name != "Unreleased" {
 								if err := g.cache.SaveVersion(version); err != nil {
 									fmt.Fprintf(os.Stderr, "Warning: Failed to save version to cache: %v\n", err)

cmd/generate_changelog/internal/git/walker.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/plumbing/storer"
 )
 
 var (
@@ -317,7 +318,7 @@ func (w *Walker) WalkHistorySinceTag(sinceTag string) (map[string]*Version, erro
 	err = commitIter.ForEach(func(c *object.Commit) error {
 		// Stop when we reach the tag commit
 		if c.Hash == tagCommit.Hash {
-			return nil
+			return storer.ErrStop
 		}
 
 		commit := &Commit{
@@ -369,6 +370,11 @@ func (w *Walker) WalkHistorySinceTag(sinceTag string) (map[string]*Version, erro
 		return nil
 	})
 
+	// Handle the stop condition - storer.ErrStop is expected
+	if err == storer.ErrStop {
+		err = nil
+	}
+
 	return versions, err
 }
 

internal/tools/patterns_loader.go

@@ -337,7 +337,7 @@ func (o *PatternsLoader) createUniquePatternsFile() (err error) {
 			}
 			fmt.Printf("📂 Also included patterns from custom directory: %s\n", o.Patterns.CustomPatternsDir)
 		} else {
-			fmt.Printf("Warning: Could not read custom patterns directory %s: %v\n", o.Patterns.CustomPatternsDir, customErr)
+			fmt.Fprintf(os.Stderr, "Warning: Could not read custom patterns directory %s: %v\n", o.Patterns.CustomPatternsDir, customErr)
 		}
 	}