Fixes calculations (#2)

Git Level (per commit):
    - Track unique file paths in FilesModified slice
    - FilesChanged = count of unique files in THIS commit

  Aggregator Level (per contributor):
    - Collect all file paths from all commits into a SET
    - FilesChanged = size of the unique file set

  Result:
    - Contributor.FilesChanged = count of UNIQUE files they touched
    - Repository contributor = unique files in THAT repo only

internal/domain/models/commit.go

@@ -4,25 +4,34 @@ import "time"
 
 // Commit represents a Git commit
 type Commit struct {
-	SHA          string    `json:"sha"`
-	Message      string    `json:"message"`
-	Author       Author    `json:"author"`
-	Committer    Author    `json:"committer"`
-	Date         time.Time `json:"date"`
-	Additions    int       `json:"additions"`
-	Deletions    int       `json:"deletions"`
-	FilesChanged int       `json:"files_changed"`
-	Repository   string    `json:"repository"` // owner/repo format
-	URL          string    `json:"url"`
+	SHA           string    `json:"sha"`
+	Message       string    `json:"message"`
+	Author        Author    `json:"author"`
+	Committer     Author    `json:"committer"`
+	Date          time.Time `json:"date"`
+	Additions     int       `json:"additions"`
+	Deletions     int       `json:"deletions"`
+	FilesChanged  int       `json:"files_changed"`
+	FilesModified []string  `json:"files_modified,omitempty"` // List of file paths modified in this commit
+	Repository    string    `json:"repository"`               // owner/repo format
+	URL           string    `json:"url"`
 
 	// Meaningful line counts (excludes comments and whitespace)
 	MeaningfulAdditions int `json:"meaningful_additions"`
 	MeaningfulDeletions int `json:"meaningful_deletions"`
 
-	// Comment line counts
+	// Comment line counts (all types of comments)
 	CommentAdditions int `json:"comment_additions"`
 	CommentDeletions int `json:"comment_deletions"`
 
+	// Documentation comment counts (JSDoc, Rust doc comments, docstrings, etc.)
+	DocCommentAdditions int `json:"doc_comment_additions"`
+	DocCommentDeletions int `json:"doc_comment_deletions"`
+
+	// Commented-out code counts (code that was commented rather than deleted)
+	CommentedCodeAdditions int `json:"commented_code_additions"`
+	CommentedCodeDeletions int `json:"commented_code_deletions"`
+
 	// Derived fields
 	HasTests bool `json:"has_tests"`
 }

internal/domain/scoring/calculator.go

@@ -293,9 +293,11 @@ func (c *Calculator) checkAchievements(cm *models.ContributorMetrics) []string {
 		case "comment_count":
 			earned = float64(cm.ReviewComments) >= ach.Condition.Threshold
 		case "lines_added":
-			earned = float64(cm.LinesAdded) >= ach.Condition.Threshold
+			// Use meaningful lines to match scoring calculation (excludes comments/whitespace)
+			earned = float64(cm.MeaningfulLinesAdded) >= ach.Condition.Threshold
 		case "lines_deleted":
-			earned = float64(cm.LinesDeleted) >= ach.Condition.Threshold
+			// Use meaningful lines to match scoring calculation (excludes comments/whitespace)
+			earned = float64(cm.MeaningfulLinesDeleted) >= ach.Condition.Threshold
 		case "avg_review_time_hours":
 			// For avg review time, lower is better, so lower threshold = harder achievement
 			if cm.AvgReviewTime > 0 && cm.AvgReviewTime <= ach.Condition.Threshold {

internal/domain/scoring/calculator_test.go

@@ -452,6 +452,8 @@ func TestCalculator_AllAchievementTypes(t *testing.T) {
 						ReviewComments:          25,
 						LinesAdded:              1500,
 						LinesDeleted:            600,
+						MeaningfulLinesAdded:    1500,
+						MeaningfulLinesDeleted:  600,
 						AvgReviewTime:           1.5,
 						UniqueReviewees:         7,
 						RepositoriesContributed: []string{"owner/repo1", "owner/repo2"},