Registers a presidio guardrail per request (default_on=False) with the
analyzer/anonymizer bases supplied in the registration params, so the test
controls its own dependency and needs no proxy restart.
presidio.pre_call.masks: a repeat-verbatim request comes back with the
<EMAIL_ADDRESS> placeholder and never the raw email, proving the prompt was
anonymized before the model saw it.
presidio.post_call.masks: with apply_to_output the model's own emitted email
is masked on the way out, so the caller never receives the raw value.
Both verified live against real presidio analyzer + anonymizer containers.
logging_only is intentionally not covered: /spend/logs exposes no prompt
messages to read back the masked log, and a logging_only run also masked the
response, contradicting its contract; noted in the module docstring for a
follow-up.
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