`src/presets.rs` — curated profiles

Two settings bundles encoding tuning for frontier vs small models, plus the shipped contributor.

Key items

• ConstrainedProfile — session_config() (32,768 window), run_config() (max 100 turns), request_options() (ToolConstraint::Strict), pipeline_builder() (output-limit → verify → memoize), apply(&mut agent) (installs context manager + pipeline + reminder).
• FrontierProfile — everything default; the explicit baseline.
• GoalReminder::new(n) — re-emits the first user message as a system reminder every n turns (skips turn 0; 0 disables).
• Constants: OUTPUT_CAP_CHARS = 16_384, MEMOIZE_TTL_TURNS = 5, write tools ["Write","Edit","MultiEdit"], memoized tools ["Read","Glob","Grep","LS"].

Behavior notes

• The pipeline order is the design: memoize innermost caches raw results; the cap outermost bounds everything below (verify diagnostics can’t escape).
• NoopVerifier/NoopPathExtractor are wired by default — functional out of the box, meant to be swapped for real ones.
• Host middleware chained onto pipeline_builder() lands inside the memoize layer — the wrong slot for anything that must see original calls.
• apply() does not set config or request options — those are separate, deliberate wiring steps.

Deep dive: Presets.