Remove superseded and dead utility functions

Behavior-preserving cleanup of functions unreachable even from tests:
- tools.CoreWriteTools / CoreShellTools — superseded by the …Scoped variants.
- workspaceindex.MaxFileDepth — unused helper.
- tui.indentText — unused string util.
- tuiTheme.onPanel2 + the now-orphaned colorPanel2 const — unused style helper.

deadcode -test=false: 114 -> 109; truly-dead: 23 -> 18. Scoped to genuine cruft only —
the remaining dead funcs are dormant/intended-but-unwired features (owner wire-vs-delete),
not blind deletes.

internal/tools/registry.go

@@ -199,7 +199,6 @@ func CoreReadOnlyToolsScoped(workspaceRoot string, scope PathScope) []Tool {
 	}
 }
 
-func CoreWriteTools(workspaceRoot string) []Tool { return CoreWriteToolsScoped(workspaceRoot, nil) }
 func CoreWriteToolsScoped(workspaceRoot string, scope PathScope) []Tool {
 	return []Tool{
 		NewScopedWriteFileTool(workspaceRoot, scope),
@@ -209,7 +208,6 @@ func CoreWriteToolsScoped(workspaceRoot string, scope PathScope) []Tool {
 	}
 }
 
-func CoreShellTools(workspaceRoot string) []Tool { return CoreShellToolsScoped(workspaceRoot, nil) }
 func CoreShellToolsScoped(workspaceRoot string, scope PathScope) []Tool {
 	return []Tool{
 		NewScopedBashTool(workspaceRoot, scope),

internal/tui/theme.go

@@ -81,7 +81,6 @@ type tuiTheme struct {
 // ink so every pairing survives 256-color downsampling.
 const (
 	colorPanel    = "#0e0e10" // card backgrounds
-	colorPanel2   = "#121215" // card header rows, picker rows
 	colorPanel3   = "#17171b" // selected/hovered row bg
 	colorLine     = "#242429" // default borders, rules
 	colorLine2    = "#414147" // emphasized borders
@@ -166,11 +165,6 @@ func (t tuiTheme) onPanel(style lipgloss.Style) lipgloss.Style {
 	return style.Background(lipgloss.Color(colorPanel))
 }
 
-// onPanel2 paints on the header/picker-row surface.
-func (t tuiTheme) onPanel2(style lipgloss.Style) lipgloss.Style {
-	return style.Background(lipgloss.Color(colorPanel2))
-}
-
 // onSel paints on the selected-row tint.
 func (t tuiTheme) onSel(style lipgloss.Style) lipgloss.Style {
 	return style.Background(lipgloss.Color(colorSelBg))

internal/tui/view.go

@@ -790,15 +790,6 @@ func firstArgValue(raw string, keys []string) string {
 	return ""
 }
 
-func indentText(text string, spaces int) string {
-	prefix := strings.Repeat(" ", spaces)
-	lines := strings.Split(text, "\n")
-	for index, line := range lines {
-		lines[index] = prefix + line
-	}
-	return strings.Join(lines, "\n")
-}
-
 // looksLikeDiff reports whether output should be rendered as a diff card: a
 // real hunk header, or both old/new file headers. A single line starting with
 // "---" (a Markdown rule, YAML document marker, log separator…) must NOT

internal/workspaceindex/workspaceindex.go

@@ -316,16 +316,6 @@ func normalizeSeparators(rel string) string {
 	return strings.ReplaceAll(filepath.ToSlash(rel), "\\", "/")
 }
 
-func MaxFileDepth(files []File) int {
-	maxDepth := 0
-	for _, file := range files {
-		if file.Depth > maxDepth {
-			maxDepth = file.Depth
-		}
-	}
-	return maxDepth
-}
-
 func SortFiles(files []File) {
 	sort.Slice(files, func(i, j int) bool {
 		return files[i].Path < files[j].Path