The credential rode in the query string on AsyncIAMClient too — the
exported one — across seventeen call sites. Same fix as the sync client:
Authorization, Basic for a confidential client.
AsyncIAMClient was DEFINED TWICE, in client.py and async_client.py, and
the copies had drifted to nineteen methods against thirty-eight. __init__
exports the one in async_client.py, so the other was unreachable; it is
gone.
Three readers of IAM_* disagreed about the tenant: IAMConfig.from_env and
fastapi.configure both defaulted the org to the literal "hanzo", so a Lux
or Zoo process that forgot IAM_ORG did not fail — it addressed the hanzo
tenant and reported hanzo's users as its own. Now one reader,
IAMConfig.from_env(org), which seeds the endpoint and the tenant from the
org it is given; organization has no default at all. A test walks the
package and asserts config.py is the only module that reads the
environment.
IAMClient.validate_token and validate_token_with_cert were a second,
weaker verifier — no issuer check, no require:["exp"]. tokens.verify does
both and fails closed, so the strict one is what survives.
118 pass, and the seventeen tests of the two consumers that build on it.