style: replace em dashes with hyphens and colons

internal/engine/data_matcher_test.go

@@ -286,7 +286,7 @@ func TestMatchDataContainersHashCollisionSafety(t *testing.T) {
 	srcRoot.Language = "json"
 
 	k2 := testutil.Leaf("string", "\"new_key\"")
-	// v2 has a different AST structure (an object with one child) — distinct child count.
+	// v2 has a different AST structure (an object with one child): distinct child count.
 	innerChild := testutil.Leaf("string", "\"inner\"")
 	v2 := testutil.Node("object", "", innerChild)
 	p2 := testutil.Node("pair", "", k2, v2)

internal/inline/options.go

@@ -5,16 +5,16 @@ package inline
 type RenderOptions struct {
 	// Color turns ANSI colors on or off.
 	Color bool
-	// ContextLines is how much context we show — defaults to 3 lines.
+	// ContextLines is how much context we show - defaults to 3 lines.
 	ContextLines int
 	// LineNumbers shows line numbers in the gutter.
 	LineNumbers bool
 	// DisableAnnotations hides the little move badges.
 	DisableAnnotations bool
 	// Wrap turns on soft wrapping to fit the terminal.
 	Wrap bool
-	// TerminalWidth is the wrap column — 0 means auto-detect or off.
+	// TerminalWidth is the wrap column - 0 means auto-detect or off.
 	TerminalWidth int
-	// TabWidth is spaces per tab — defaults to 4.
+	// TabWidth is spaces per tab - defaults to 4.
 	TabWidth int
 }

internal/inline/render_test.go

@@ -658,7 +658,7 @@ func TestRender_LineWrapping_ColorMode(t *testing.T) {
 	got := Render("old.go", "new.go", src, dst, dr.Envelope, opts)
 
 	lines := strings.Split(got, "\n")
-	// Continuation rows shouldn't have color codes in the gutter — it should be plain spaces.
+	// Continuation rows shouldn't have color codes in the gutter - it should be plain spaces.
 	// With ~5 lines, numWidth is 3, so the gutter is 9 chars wide in color mode.
 	const contGutterWidth = 9
 	for _, l := range lines {

internal/inline/slicer.go

@@ -190,7 +190,7 @@ func sliceInlineLine(
 			}
 
 			if curDisplayCol+tabSpaces > maxTextWidth {
-				// Tab doesn't fit — wrap and reset the tab stop.
+				// Tab doesn't fit - wrap and reset the tab stop.
 				finishChunk()
 				tabSpaces = tabWidth
 			}
@@ -227,7 +227,7 @@ func sliceInlineLine(
 		if curDisplayCol+tok.displayWidth > maxTextWidth {
 			// Token doesn't fit on this row.
 			if tok.displayWidth > targetWidth {
-				// Too long for any row — cut it rune by rune.
+				// Too long for any row - cut it rune by rune.
 				currRuneOffset := byteOffset
 				for currRuneOffset < byteOffset+tok.byteLen {
 					r, rLen := utf8.DecodeRuneInString(lineText[currRuneOffset:])
@@ -261,7 +261,7 @@ func sliceInlineLine(
 				continue
 			}
 
-			// It fits on the next row — wrap at the word boundary.
+			// It fits on the next row - wrap at the word boundary.
 			finishChunk()
 		}
 
@@ -300,7 +300,7 @@ func sliceInlineLine(
 	}
 
 	// Badge goes at the end of the whole line (last visual row), not the
-	// first — that way it doesn't steal width from the first row and end
+	// first - that way it doesn't steal width from the first row and end
 	// up mid-sentence.
 	if badgeText != "" {
 		if len(chunks) > 0 {

internal/pipeline/pipeline_test.go

@@ -36,7 +36,7 @@ func TestPipeline_LineLimitFallback(t *testing.T) {
 		t.Errorf("expected AST parsed when line limit disabled")
 	}
 
-	// With higher limit of 20, file has fewer lines — should parse as AST.
+	// With higher limit of 20, file has fewer lines - should parse as AST.
 	resHigher, err := Run(content, content, "main.go", "main.go", DiffOptions{
 		MaxASTFileLines: 20,
 	})

internal/postprocess/normalize_test.go

@@ -648,7 +648,7 @@ func TestIsTrivialJumpBody(t *testing.T) {
 		}
 	})
 
-	// An error print followed by an exit is still boilerplate — the print
+	// An error print followed by an exit is still boilerplate - the print
 	// shouldn't keep it from being scored as a trivial exit block.
 	t.Run("body pairing an error print with a terminating call is trivial", func(t *testing.T) {
 		openBrace := mkNode("{", "{")
@@ -990,7 +990,7 @@ func TestNormalizeMovesByStructure(t *testing.T) {
 		dstStmt.StartRow = 200
 		dstBlock.Children = []*treesitter.ASTNode{dstStmt}
 
-		// No parent mapping — cross-scope with no mapped enclosing decl.
+		// No parent mapping: cross-scope with no mapped enclosing decl.
 		ms2 := engine.NewMapping()
 
 		es := actions.NewEditScript()

tests/e2e/cli_test.go

@@ -362,7 +362,7 @@ format: actions
 	_ = os.WriteFile(oldPath, []byte(oldContent), 0o644)
 	_ = os.WriteFile(newPath, []byte(newContent), 0o644)
 
-	// No CLI flags passed — should pick up format=actions and ignore_comments from config
+	// No CLI flags passed - should pick up format=actions and ignore_comments from config
 	stdout, stderr, err := runDiffm(oldPath, newPath)
 	if err != nil {
 		t.Fatalf("diffm failed with custom config: %v\nstderr: %s", err, stderr)