Follow-up to f07c39f (hanzo-iam 1.30.0). Consumer packages now read only
the canonical IAM_ prefix — no upstream-brand alias chain, matching the
new IAMConfig.ENV_PREFIX contract enforced by test_env.py.
Touched modules:
- hanzo-cli: hanzo_cli/auth.py, hanzo_cli/bot/commands.py
- hanzo-tools-auth: hanzo_tools/auth/session.py
- hanzo-tools-iam: hanzo_tools/iam/iam_tool.py
- hanzo: src/hanzo/commands/{auth,iam}.py
- hanzoai: auth.py, llm_client.py
- tests: test_auth_pkce.py (import IAM_CLIENT_ID)
Also adds the generated pkg/hanzo-iam/uv.lock — matches the convention
of the other 17 axis pkgs that track their lockfiles.