flux-local diff fails if spec.template exists in manifest

[bolsblue]

When running flux-local diff (ks or hr), it fails with a traceback when a manifest contains a spec.template field.
For example:

apiVersion: postgresql.cnpg.io/v1
kind: Database
metadata:
  name: paperless
  namespace: postgres
spec:
  name: paperless
  owner: paperless
  cluster:
    name: pg
  template: template0
  encoding: UTF8
  localeCollate: en_US.UTF-8
  localeCType: en_US.UTF-8

$ flux-local diff ks -A  
Traceback (most recent call last):
  File "/Users/mbg/.local/bin/flux-local", line 10, in <module>
    sys.exit(main())
             ~~~~^^
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/tool/flux_local.py", line 64, in main
    asyncio.get_event_loop().run_until_complete(action.run(**vars(args)))
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.13/3.13.5/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/tool/diff.py", line 147, in run
    await git_repo.build_manifest(
        selector=query, options=selector.options(**kwargs)
    )
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/git_repo.py", line 826, in build_manifest
    await asyncio.gather(*kustomization_tasks)
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/git_repo.py", line 811, in update_kustomization
    await asyncio.gather(*build_tasks)
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/git_repo.py", line 643, in build_kustomization
    await kustomization_selector.visitor.func(
    ...<3 lines>...
    )
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/visitor.py", line 195, in call_async
    strip_resource_attributes(resource, self.strip_attributes)
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/mbg/.local/share/uv/tools/flux-local/lib/python3.13/site-packages/flux_local/manifest.py", line 1056, in strip_resource_attributes
    and (meta := templ.get("metadata"))
                 ^^^^^^^^^
AttributeError: 'str' object has no attribute 'get'

Removing the template field fixes the problem.