chore: Claude-first setup

[mmagician]

Desired workflow:

1. Point Claude at an issue, ask it to create a PR to address it
2. Plan
3. Once plan is approved, Claude works on the implementation
4. Before a commit, executes a hook to make lint
5. Before push:

• runs make test
• runs two review agents; if any agent comes back with findings, main agent fixes these

6. Before creating PR, ensures the PR is being created in --draft mode
7. After PR is created, checks if CHANGELOG.md exists; if yes, proceeds; if not, determines whether it should add an entry or a no changelog label - the main agent takes care of this.
8. PR author manually reviews the PR; if all looks good, he requests reviews from peers; else explains to Claude what should change and codifies this as skill/hook, so that next time Claude doesn't make the same mistake. As you can see from the commit history, I've had a few iterations on this, but at the end this resulting PR is basically one-shotted. We should aim at one-shoting 95% of our PRs (and 5% would result in skills/hooks being updated).
9. Peers/code owners review the PR. As with the previous point, requested changes (patterns/standards/Miden-specific practices) should be codified.

The goal is to codify our shared knowledge into a set of actionable artifacts.

TODOs:

• still missing the skills folder (ATM I was using the skills from https://github.com/0xMiden/agent-skills symlinked into my global ~/.claude dir)
• MASM code formatter needed!