Feature#36 - Update state of the library

[emapuljak]

Summary

This PR updates the library, documentation examples, tests, and CI/CD pipeline to make the project easier to maintain and safer to merge.

It adds automated checks for linting, formatting, typing, security, tests, coverage, and notebooks; updates the supported Python versions to Python >=3.10; expands test coverage; and fixes several library issues found while enabling stricter checks.

Main Changes

• Added CI and pre-merge GitHub Actions workflows.
• Added pytest matrix for Python 3.10, 3.11, and 3.12.
• Added Ruff, mypy, Bandit, pytest, coverage, and notebook execution checks.
• Added pre-commit configuration for local checks.
• Updated README badges to point to real CI/docs workflows.
• Dropped support for Python <3.10 in package metadata.
• Renamed test/ to tests/.
• Added and expanded tests for embeddings, metrics, models, strategy, eval, and utilities.
• Fixed notebook metadata cleanup so environment/kernel details are not committed.
• Updated and cleaned documentation notebooks and example scripts.
• Added TNAD latent example documentation/index page.
• Updated docs image assets and paths.
• Improved model saving behavior and runtime path handling.
• Fixed sweeping strategy behavior, optimizer state indexing, and quimb compatibility.
• Fixed SMPO prediction/application edge cases for single-output tensors.
• Fixed metrics failures around SMPO output shapes.
• Fixed mypy and Ruff issues across library, docs examples, and tests.

Verification

The branch has been checked with:

• ruff check .
• ruff format --check .
• mypy .
• targeted pytest runs for the recently fixed failures

CI now also runs the main checks online, including pytest across Python 3.10, 3.11, and 3.12.