fix: address twelfth round of Copilot PR review feedback

- Persist normalized strategy: write lowercase value back to tmpl dict
  so downstream composition logic always sees lowercase
- Normalize strategy in PowerShell: .ToLowerInvariant() after parsing
- Fix bash tab parsing: use IFS+read instead of parameter expansion to
  avoid trailing newline in manifest_file; normalize with ${strategy,,}
- Gate CLI composition message: only show 'Final output is composed...'
  when the top layer is non-replace (top replace wins outright)

Author: mnriem

scripts/bash/common.sh

@@ -441,8 +441,8 @@ try:
 except Exception:
     print('replace\t')
 " 2>/dev/null) && {
-                                strategy="${result%%	*}"
-                                manifest_file="${result#*	}"
+                                IFS=$'\t' read -r strategy manifest_file <<< "$result"
+                                strategy="${strategy,,}"  # normalize to lowercase
                             }
                         fi
                         # Try manifest file path first, then convention path

scripts/powershell/common.ps1

@@ -443,7 +443,7 @@ except Exception:
 "@ $manifest $TemplateName 2>$null
                         if ($stratResult) {
                             $parts = $stratResult.Trim() -split "`t", 2
-                            $strategy = $parts[0]
+                            $strategy = $parts[0].ToLowerInvariant()
                             if ($parts.Count -gt 1 -and $parts[1]) { $manifestFilePath = $parts[1] }
                         }
                     } catch {

src/specify_cli/__init__.py

@@ -2606,7 +2606,10 @@ def preset_resolve(
         console.print(f"  [bold]{template_name}[/bold]: {display_layer['path']}")
         console.print(f"    [dim](top layer from: {display_layer['source']})[/dim]")
 
-        has_composition = any(layer["strategy"] != "replace" for layer in layers)
+        has_composition = (
+            layers[0]["strategy"] != "replace"
+            and any(layer["strategy"] != "replace" for layer in layers)
+        )
         if has_composition:
             console.print("    [dim]Final output is composed from multiple preset layers; the path above is the highest-priority contributing layer.[/dim]")
             console.print("\n  [bold]Composition chain:[/bold]")

src/specify_cli/presets.py

@@ -162,6 +162,9 @@ def _validate(self):
                     f"got {type(strategy).__name__}"
                 )
             strategy = strategy.lower()
+            # Persist normalized value so downstream code sees lowercase
+            if "strategy" in tmpl:
+                tmpl["strategy"] = strategy
             if strategy not in VALID_PRESET_STRATEGIES:
                 raise PresetValidationError(
                     f"Invalid strategy '{strategy}': "