Removes the `role: Literal["analyst", "admin"]` parameter from
`resolve_lines` / `render_setup_instructions` and deletes the
`_resolve_analyst_lines`, `_analyst_init_lines`, `_analyst_finale_lines`
helpers. The unified flow now always emits `agnes init` (the
workspace-rails delivery mechanism) in place of the legacy
`agnes auth import-token` + `agnes auth whoami` pair, and uses
`agnes catalog` as the smoke-verify step.
`agnes init` already verifies the PAT internally, and `agnes catalog`
doubles as a data-plane smoke check, so dropping `agnes auth whoami`
costs no signal.
Drops the now-redundant `tests/test_setup_instructions_analyst.py` and
patches the one ordering test in `tests/test_setup_instructions.py` that
referenced the old "Log in" / "Verify the login" headers. Also strips
the `role=role` kwarg from `compute_default_agent_prompt`'s call into
`resolve_lines` so the welcome-template render path keeps working;
welcome_template.py's own role param is removed in a follow-up task.
Plan: docs/superpowers/plans/2026-05-04-unified-setup-prompt.md task 1.
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