ci: lint docs/assets/scripts in make lint and CI

[Chouffe]

Summary

• Add a root-level ruff.toml as the authoritative ruff config for scripts outside the packages, mirroring the identical [tool.ruff] config every package already declares
• Hook docs/assets/scripts/ into the root make lint / make format targets, running ruff via core's venv
• Add a docs-scripts CI job running ruff check + ruff format --check on the scripts, with a lightweight uv sync --only-group dev of core (no torch install)

Closes #43

Test Plan

• make lint passes end-to-end, including the new docs/assets/scripts step
• Canary file with unsorted imports is flagged (I001), proving the root ruff.toml is discovered — the isort rule is not in ruff's defaults
• Package linting unaffected (per-package pyproject.toml config is closer and wins)
• Exact CI command sequence verified locally (uv sync --only-group dev + uv run --project core --no-sync ruff ...)
• core test suite passes (250 tests)

[MateoLostanlen]

LGTM. Verified the mechanics hold: ruff is in core's dev group so the torch-free uv sync --only-group dev + --no-sync ruff works, and with no root pyproject.toml the new ruff.toml is discovered for docs/assets/scripts while per-package configs stay closer and win. CI follows existing conventions and the I001 canary is a nice proof.

Two non-blocking notes:

• Config is now duplicated 6× (5 packages + root), enforced only by the "keep in sync" comment. Worth a follow-up to centralize via ruff's extend.
• make lint/format omit the --no-sync that CI uses, so a local run can trigger a full core sync (torch). Minor asymmetry, fine as-is.