PASS: serving cert carries Basic Constraints CA:TRUE (mimics Proton Bridge)
=== generate himalaya.toml via integration_proton._build_config ===
GENERATED himalaya.toml
=== generated config: integration pins imap.tls.cert + smtp.tls.cert ===
PASS: generated himalaya config pins imap.tls.cert at the Bridge cert
PASS: generated himalaya config pins smtp.tls.cert at the Bridge cert
=== IMAP positive: himalaya trusts the CA:TRUE cert via the integration's pin ===
PASS: himalaya completed TLS against the CA:TRUE cert (integration pin works)
PASS: no CaUsedAsEndEntity / cert error from himalaya when pinned
=== IMAP negative: strip the integration's pin -> default verifier rejects CA:TRUE ===
PASS: without the pin himalaya rejects the CA:TRUE cert (the hazard is real)
=== SMTP positive: himalaya trusts the CA:TRUE cert via the integration's pin ===
PASS: himalaya trusted the CA:TRUE cert via smtp.tls.cert (no cert error)
=== SMTP negative: strip the integration's pin -> default verifier rejects CA:TRUE ===
PASS: without the pin himalaya rejects the CA:TRUE cert over SMTP

RESULT: ALL-PASS