feat(scripts): port create-new-feature, setup-plan and setup-tasks to Python

scripts/powershell/setup-tasks.ps1

@@ -45,8 +45,8 @@ if (Test-Path $paths.QUICKSTART) { $docs += 'quickstart.md' }
 # Resolve tasks template through override stack
 $tasksTemplate = Resolve-Template -TemplateName 'tasks-template' -RepoRoot $paths.REPO_ROOT
 if (-not $tasksTemplate -or -not (Test-Path -LiteralPath $tasksTemplate -PathType Leaf)) {
-    $expectedCoreTemplate = Join-Path $paths.REPO_ROOT '.specify/templates/tasks-template.md'
-    [Console]::Error.WriteLine("ERROR: Tasks template not found for repository root: $($paths.REPO_ROOT)`nTemplate resolution order: overrides -> presets -> extensions -> core.`nExpected shared/core template location: $expectedCoreTemplate`nTo continue, verify whether 'tasks-template.md' is available in '.specify/templates/overrides/', preset templates, extension templates, or restore the shared/core templates (for example by re-running 'specify init') so that '.specify/templates/tasks-template.md' exists.")
+    [Console]::Error.WriteLine("ERROR: Could not resolve required tasks-template from the template override stack for $($paths.REPO_ROOT)")
+    [Console]::Error.WriteLine("Template 'tasks-template' was not found in any supported location (overrides, presets, extensions, or shared core). Add an override at .specify/templates/overrides/tasks-template.md, or run 'specify init' / reinstall shared infra to restore the core .specify/templates/tasks-template.md template.")
     exit 1
 }
 $tasksTemplate = (Resolve-Path -LiteralPath $tasksTemplate).Path

scripts/python/common.py

@@ -182,6 +182,78 @@ def get_feature_paths(
     )
 
 
+def _sorted_preset_ids(presets_dir: Path) -> list[str]:
+    registry = presets_dir / ".registry"
+    if registry.is_file():
+        # Mirrors bash: any failure while reading or sorting the registry
+        # (invalid JSON, non-dict shapes, unorderable priority values) falls
+        # back to the directory scan below.
+        try:
+            data = json.loads(registry.read_text(encoding="utf-8"))
+            presets = data.get("presets", {})
+            return [
+                pid
+                for pid, meta in sorted(
+                    presets.items(),
+                    key=lambda kv: kv[1].get("priority", 10)
+                    if isinstance(kv[1], dict)
+                    else 10,
+                )
+                if isinstance(meta, dict) and meta.get("enabled", True) is not False
+            ]
+        except Exception:
+            pass
+    try:
+        return sorted(
+            p.name
+            for p in presets_dir.iterdir()
+            if p.is_dir() and not p.name.startswith(".")
+        )
+    except OSError:
+        return []
+
+
+def resolve_template(template_name: str, repo_root: Path) -> Path | None:
+    """Resolve a template name to a file path using the priority stack.
+
+    Order (mirrors resolve_template in scripts/bash/common.sh):
+      1. .specify/templates/overrides/
+      2. .specify/presets/<preset-id>/templates/ (sorted by .registry priority)
+      3. .specify/extensions/<ext-id>/templates/ (hidden directories skipped)
+      4. .specify/templates/ (core)
+    """
+    base = repo_root / ".specify" / "templates"
+
+    override = base / "overrides" / f"{template_name}.md"
+    if override.is_file():
+        return override
+
+    presets_dir = repo_root / ".specify" / "presets"
+    if presets_dir.is_dir():
+        for preset_id in _sorted_preset_ids(presets_dir):
+            candidate = presets_dir / preset_id / "templates" / f"{template_name}.md"
+            if candidate.is_file():
+                return candidate
+
+    ext_dir = repo_root / ".specify" / "extensions"
+    if ext_dir.is_dir():
+        try:
+            extensions = sorted(p for p in ext_dir.iterdir() if p.is_dir())
+        except OSError:
+            extensions = []
+        for ext in extensions:
+            if ext.name.startswith("."):
+                continue
+            candidate = ext / "templates" / f"{template_name}.md"
+            if candidate.is_file():
+                return candidate
+
+    core = base / f"{template_name}.md"
+    if core.is_file():
+        return core
+    return None
+
+
 def get_invoke_separator(repo_root: Path) -> str:
     integration_json = repo_root / ".specify" / "integration.json"
     if not integration_json.is_file():