Update minimum python and package versions and template

[samaloney]

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Pull request overview

Updates SMARTpy’s project scaffolding to align with a newer SunPy package template, raising the supported Python/dependency floor and modernizing CI/docs tooling.

Changes:

• Bump minimum supported Python to 3.12 and update key dependency minimums (e.g., sunpy[map], scikit-image).
• Refresh CI/pre-commit/Ruff configuration and GitHub Actions workflows (including Codecov OIDC + new security/maintenance workflows).
• Add/extend changelog + “what’s new” documentation plumbing (Towncrier + Sphinx changelog integration).

File summaries

File	Description
tox.ini	Update tox env matrix and set COVERAGE_FILE for consistent coverage output.
smart/tests/test_map_processing.py	Make fixtures session-scoped and reformat one assertion.
smart/tests/test_calculate_properties.py	Reformat map URL fixture construction.
smart/indexed_grown_mask.py	Reformat function signature to a single line.
smart/_dev/scm_version.py	Switch to pathlib.Path for setuptools_scm root handling.
smart/_dev/init.py	Fix dev-package docstring wording.
README.rst	Replace license/disclaimer section with AI-usage + contribution pointers.
pyproject.toml	Raise requires-python, bump dependencies, update setuptools_scm config, add URLs and docs deps.
MANIFEST.in	Exclude/prune additional template/CI files from source distributions.
licenses/LICENSE.rst	Adjust BSD clause naming.
docs/whatsnew/index.rst	Add release-history index page.
docs/whatsnew/changelog.rst	Add sphinx-changelog directive wired to Towncrier/CHANGELOG.
docs/index.rst	Add “what’s new” to the docs toctree and add indices/tables.
docs/conf.py	Improve version rendering logic and enable sphinx-changelog + graphviz settings.
changelog/README.rst	Expand guidance for writing Towncrier news fragments.
changelog/19.breaking.rst	Add breaking-change fragment documenting dependency floor bumps.
CHANGELOG.rst	Included in PR context (no diff shown).
.ruff.toml	Update target version/line length and expand lint/isort configuration.
.rtd-environment.yml	Bump RTD conda environment Python to 3.12.
.readthedocs.yaml	Modernize RTD build image/toolchain selection.
.pre-commit-config.yaml	Update hooks (Ruff-format replacing isort) and add sphinx-lint/codespell improvements.
.isort.cfg	Remove legacy isort configuration (migrated to Ruff isort settings).
.github/workflows/zizmor.yml	Add zizmor GitHub Actions security analysis workflow.
.github/workflows/sub_package_update.yml	Harden and extend cruft-based template update workflow.
.github/workflows/label_sync.yml	Add scheduled label-sync workflow.
.github/workflows/ci.yml	Update CI to OA reusable workflows, add publish workflow pieces, and enable Codecov OIDC.
.github/dependabot.yml	Add Dependabot config for GitHub Actions updates.
.cruft.json	Update cruft template commit and context defaults.
.coveragerc	Exclude smart/_dev from coverage collection.

Review details

• Files reviewed: 28/29 changed files
• Comments generated: 12
• Review effort level: Lite

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