`jarvis ask "..."` (no `--agent` flag) routed straight to
`engine.generate()` regardless of `agent.default_agent` in the user's
config. As a result the persona stack — `agent.default_system_prompt`,
SOUL.md, MEMORY.md, USER.md — was silently bypassed for the most
common command.
Behavior now:
- `--agent X` → use agent X (unchanged)
- `--agent ""` (empty) → explicit opt-out, direct-to-engine mode
- (omitted) → fall back to `config.agent.default_agent`,
which dataclass-defaults to `"simple"`,
so persona settings finally take effect
Tests:
- Rename `test_no_agent_uses_direct_mode` to
`test_no_agent_flag_falls_back_to_config_default_agent` and update
its docstring to document the new behavior.
- Add `test_explicit_empty_agent_opts_out_of_agent_mode`.
- Add `test_no_agent_with_blank_config_default_uses_direct_mode` to
cover the case where the user clears `default_agent`.
- Update `_patch_engine` (test_ask_router) and `_patch_ask`
(test_ask_e2e) to re-register `SimpleAgent` after the autouse
`_clean_registries` conftest fixture, since the agent path now
runs in tests that previously short-circuited to direct mode.
- Add explicit `cfg.agent.default_agent = ""` to two
`test_ask_router` tests that mock load_config with a MagicMock
(so `cfg.agent.default_agent` doesn't auto-create as a truthy mock).
Note: `tests/cli/test_ask_context.py` has 2 unrelated pre-existing
failures on origin/main (memory backend returns None on Windows);
those are out of scope for this PR.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
