ADR setup

Bootstraps a decision log in the current repository. This skill sets the structure up once. After that, two things keep ADRs written and true:

• the agent-instructions section it installs;
• the check it offers to add to CI.

An agent starts every session without memory of past discussions. If a decision isn't written down, the agent doesn't know it exists and may "improve" the code by undoing it. The setup below makes accepted decisions part of the context every session reads.

A log that drifts is worse than none. A stale record, or a code comment citing a replaced one, reads to an agent as current truth. That's why the CI check matters.

Conventions this setup installs