`src/engine/bare/config.rs` — the builder surface

Every set_* / with_* method on BareLoop, the temp-dir management, and the TextStreamer type.

Key items

• Setters (all debug_assert_idle — before first run): set_reflector, set_recovery_strategy, set_context_manager (re-syncs window/threshold from session config), set_token_counter (driver fallback only — the manager’s counter rules), set_stream_handler [streaming], set_hook_executor [hooks], set_health_registry [tool_health], set_memory, set_pipeline (injects the loop’s registry as core), register_observer, set_text_streamer, add_contributor, set_request_options, set_turn_mode — each with a fluent with_* twin.
• with_temp_dir(base) / with_managed_temp_disabled() — managed temp control.
• TextStreamer = Arc<dyn Fn(&str) + Send + Sync> — the simple per-chunk text callback.
• debug_assert_idle() — debug panics if the machine advanced past Start.

Behavior notes

• set_pipeline never takes a builder with a core — it injects the loop’s own registry; building manually elsewhere needs with_core.
• The two token counters (driver fallback vs manager) are deliberately not synced — configure the manager’s and the driver follows it.
• set_context_manager syncs window/threshold from the session config — the session config owns window policy.

Deep dive: The driver.