Closes#2.
Previously the cert minting script lived in local-tools/ (gitignored)
and the README pointed at a cert-only source that didn't include the
private key or upstream chain.
setup_cert.py now lives at the repo root and live-fetches both the
peer UUID (from the relevant TLS server cert subject DN) and the
full AC14K_M + upstream chain bundle (RemoteAccessCA + CECA + ROOTCA)
from a public mirror. Each fetch has an inline workaround if the
network is restricted (UUID=..., AC14K_M_CERT_BUNDLE=...,
BRAYSTORM_URL=...). Modulus-pair check catches a wrong-key mistake
before signing. bootstrap.py removed -- imported a package that was
renamed in commit 709fdf4.
Output files use neutral client.* names. README, .env.example,
docker-compose.yml, deploy.sh, and config.py updated to match.
Provenance receipts in local-tools/cert_provenance.md.
Marc Billow