Playing around with claude code, and optimizations

[Ville M. Vainio]

Fyi,

There are some interesting optimizations and measurements available here:

https://github.com/leo-editor/leo-editor/pull/4615

[Ville M. Vainio]

And the Clauding continued!

I opened a handful of small, independent PRs against `devel` today:

- #4615 — Quick perf pass on core: ~3x faster cold open via leoBridge.
- #4617 — Colorizer: fix accidentally-quadratic jupytext check in `python_comment` (4x speedup).
- #4618 — Colorizer: skip `setTag` debug trace by default (~65% less time in `setTag`).
- #4619 — Colorizer: misc micro-optimizations (cherry-pickable).
- #4620 — Add GitHub Actions CI: ruff lint on push/PR to devel.
- #4621 — Fix all mypy errors on the `leo/core` import surface (QWidget/Qt TypeAlias fixes; 270 → 0).
- #4622 — Replace implicit Optional parameters with explicit `T | None` across core/commands/plugins (71 files, mechanical codemod).

Each PR is scoped narrowly so they can be reviewed and merged independently.

[Edward K. Ream]

Wow. Many thanks for starting the ball rolling.

I've made a note of your PRs and will review and approve asap.  This is totally cool stuff!

Edward

[Thomas Passin]

Very good indeed! I haven't tried chatbots for this kind of work. I've had enough trouble getting them to complete some small ab initio programs that it hadn't occurred to me to try. Thanks!