_get_anthropic_sdk() swallowed every ensure_import("anthropic") failure and
_require_sdk() then told the user to "Install it with: hermes pm install
--extra anthropic". PM often HAS installed it: sync_venv succeeds into a new
dependency environment that only activates at process boot, and
ensure_import raises "installed; restart Hermes". A lazy-install guard
("this process is not running from the install's dependency environment")
was flattened the same way. Users were told to install something that was
installed, or given a command that doesn't address the actual refusal.
Keep the import as the decider, but remember the InstallError and put its
text in the ImportError. bedrock_adapter._require_boto3 had the identical
shape; azure_identity_adapter already propagates str(exc) and is the model.
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