pytest.raises(match=...) is case-sensitive by default. The error
message starts with "Neither" (capital N) but the regex used lowercase
"neither", causing CI failures on Linux.
When neither apptainer nor singularity is installed, the Singularity
backend silently defaults to "singularity" and fails with a cryptic
FileNotFoundError inside _start_instance(). Add a preflight check
that resolves the executable and verifies it responds, raising a
clear RuntimeError with install instructions on failure.
Closes#1511
Terminal subprocesses inherit OPENAI_BASE_URL and other provider env
vars loaded from ~/.hermes/.env, silently misrouting external CLIs
like codex. Build a blocklist dynamically from the provider registry
so new providers are automatically covered. Callers that truly need
a blocked var can opt in via the _HERMES_FORCE_ prefix.
Closes#1002
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Muhammet Eren Karakuş