Brummel
d3cb5f8052
Family runs (sweep, Monte-Carlo, walk-forward) ran a full harness per
member and drained its equity+exposure recorders, but immediately folded
the streams to metrics and discarded them — so the C21 family-comparison
view had no per-member data to chart. A new opt-in `--trace <name>` on
`aura sweep|mc|walkforward` now persists each member's streams to disk,
mirroring the single-run `aura run --trace` path. Any single member is
chartable today via `aura chart <name>/<member_key>`; the comparison view
itself is a later cycle.
Design:
- Persist INSIDE each per-member closure (aura-cli), reusing persist_traces
verbatim — the engine and the family types are untouched. The closures
already held the drained rows; they now bind them once, build the
manifest, persist when --trace is set, then fold as before.
- Content-derived, deterministic member keys (MC seed{N}, sweep f{fast}s{slow},
walk-forward oos{ns}). The engine HOFs are Fn + Sync — members run in
parallel, so a runtime ordinal counter would be non-deterministic (a C1
break); keys derive from what each closure receives deterministically.
sweep_member_key panics (naming the axis) if the grid lacks a key axis,
rather than silently collapsing two points to a shared dir.
- Each member is a standalone run-dir at runs/traces/<name>/<member_key>/
(persist_traces with a slash-name; TraceStore nests via create_dir_all),
so the existing single-run viewer charts a member with no view-side code.
- Opt-in: without --trace, stdout and the run registry are byte-unchanged;
the cardinality cost of N members x full resolution stays user-chosen.
Out of scope (deferred): the family-comparison view (overlay/small-multiples),
decimation/LOD, a binary trace container.
Verified locally: cargo build --workspace, cargo test --workspace (all green,
incl. 3 new family persistence tests + a sweep determinism test + 2
sweep_member_key unit tests), cargo clippy --workspace --all-targets
-D warnings (clean). The pre-existing family determinism and single-run
trace tests pass unchanged (no-trace path is byte-identical).
closes #104