Add ruff, pre -commit hook and CI pipeline when a PR is made

[MechaCritter]

• Ruff linter now runs every commit (user has to install)
• Added pre-commit hook file
• Added ci.yaml file for github workflows

[Copilot]

Pull request overview

This PR introduces Ruff-based formatting/linting and pre-commit automation, and adds a GitHub Actions CI workflow intended to run checks on pull requests. In addition to tooling, it applies broad formatting/import cleanups across the codebase to align with the new Ruff configuration.

Changes:

• Add Ruff configuration (lint + formatter) and a make fmt target.
• Add .pre-commit-config.yaml with Ruff formatting, codespell, and common repo hygiene hooks.
• Add a PR CI workflow to run mypy and Ruff checks.

Reviewed changes

Copilot reviewed 21 out of 33 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
README.md	Whitespace/formatting normalization.
pyvisim/neural_networks/README.md	Minor formatting cleanup.
pyvisim/features/README.md	Minor formatting cleanup.
pyvisim/features/_features.py	Import/type/format adjustments for Ruff/mypy alignment.
pyvisim/features/init.py	Import ordering/formatting cleanup.
pyvisim/eval.py	Import/formatting cleanup in evaluation helpers.
pyvisim/encoders/vlad.py	Reformatting and minor logic touchpoints in encoder implementation.
pyvisim/encoders/README.md	Whitespace/formatting normalization.
pyvisim/encoders/pipeline.py	Import ordering and formatting updates.
pyvisim/encoders/fisher_vector.py	Import ordering and formatting updates.
pyvisim/encoders/_base_encoder.py	Typing/import updates and formatting cleanup.
pyvisim/encoders/init.py	Import ordering/formatting cleanup.
pyvisim/datasets/datasets.py	Import ordering/formatting cleanup in dataset utilities.
pyvisim/datasets/init.py	Formatting normalization.
pyvisim/_errors.py	Formatting normalization.
pyvisim/_config.py	Formatting cleanup and minor I/O style adjustments.
pyvisim/_base_classes.py	Typing/import updates and formatting cleanup.
pyvisim/init.py	Formatting normalization.
pyproject.toml	Add Ruff + codespell config; define uv dependency groups for tooling.
Makefile	Add fmt target using Ruff.
LICENSE	Formatting normalization.
examples/m_ap_and_top_k_accuracy.ipynb	Notebook JSON reformatting/import ordering updates.
CONTRIBUTING.md	Update contributor workflow to include formatting and pre-commit install.
.pre-commit-config.yaml	New pre-commit hooks for formatting, spellcheck, and workflow linting.
.gitignore	Formatting normalization.
.github/workflow/ci.yml	New CI workflow for mypy + Ruff checks on PRs.
.flake8	Formatting normalization.

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