Set repository basepath to '~/.cache/skyllh' by default

[tomaskontrimas]

Provide a default path that is mostly useful for public data analyses as i3skyllh overwrites it to /data/ana/analyses (avoiding data copy).

After this is merged we should update tutorial notebooks in the documentation branch, removing hardcoded paths.

[Copilot]

Pull request overview

This PR sets a non-None default repository base path intended to make public-data analyses work out-of-the-box, and updates related docstrings to describe the new default.

Changes:

• Set cfg['repository']['base_path'] default to ~/.cache/skyllh (expanded) in the global base config.
• Update dataset and dataset-collection docstrings to mention the new default base path behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
skyllh/core/config.py	Changes the default repository base path from None to a user-cache location.
skyllh/core/dataset.py	Updates Dataset constructor docs to mention the default base path.
skyllh/datasets/i3/TestData.py	Updates dataset-collection docs to mention the default base path.
skyllh/datasets/i3/PublicData_10y_ps.py	Updates dataset-collection docs to mention the default base path.
skyllh/datasets/i3/PublicData_10y_ps_wMC.py	Updates dataset-collection docs to mention the default base path.
skyllh/datasets/i3/PublicData_14y_ps.py	Updates dataset-collection docs to mention the default base path.

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[Copilot]

_BASECONFIG['repository']['base_path'] is now a Path object. Most of the codebase (and the surrounding docstrings/type hints) treat config values as plain serializable primitives (here: str | None). Keeping a Path in the config can surprise callers (e.g., string concatenation, YAML/JSON serialization) and diverges from the documented str type. Consider storing this as a string (e.g., expand ~ to a str) and only converting to Path at the call site when needed.

Suggested change

	'base_path': Path('~/.cache/skyllh').expanduser(),
	'base_path': str(Path('~/.cache/skyllh').expanduser()),

[tomaskontrimas]

done

[Copilot]

The base_path parameter docstring now refers to cfg['repository']['base_path'], but cfg is not a documented parameter of Dataset.__init__ (it’s only passed implicitly via **kwargs to HasConfig). This makes the docstring harder to follow and introduces an undefined name in the parameter docs. Consider rephrasing to reference the dataset’s config (self.cfg['repository']['base_path']) or the Config setting in general, without relying on an undocumented cfg symbol.

Suggested change

	If set to ``None``, ``cfg['repository']['base_path']`` is used,
	which defaults to ``~/.cache/skyllh``.
	If set to ``None``, the dataset configuration's repository base
	path setting is used, which defaults to ``~/.cache/skyllh``.

[tomaskontrimas]

done