The shell no longer defines what an aura backtest is. Tasks 1-9 of the
shell-boundary cycle — structural extraction, behaviour byte-identical:
- aura-runner (new; the C28 assembly position): input binding (the C26
module, moved whole), the C1-load-bearing param<->config translators,
harness assembly (wrap_r / run_signal_r / run_blueprint_member and the
probe/reopen cluster), axis + risk-regime conventions (bind_axes et
al.), the campaign family builders + MC guards, reproduce
(process::exit -> RunnerError, shell remaps to identical bytes), the
measurement-run orchestration, project loading (Env / cdylib load /
charter / staleness, moved whole), the coverage gap-walk (deduplicated
onto interior_gap_months), and DefaultMemberRunner — the public
implementation of aura_campaign::MemberRunner (ex CliMemberRunner).
The MemberRunner trait stays in aura-campaign; the column still
imports no harness/data-binding machinery.
- aura-measurement (new; seeds C28 rung 3): the IcMetrics/IcKey
vocabulary + information_coefficient, verbatim incl. serde derives
(#294 duplicate-timestamp semantics move as-is, unresolved).
- aura-backtest: the pure per-run scaffold (point_from_params,
wf_ms_sizes / fit_wf_ms_sizes, intersect_shared_window).
- shell residue: main.rs / campaign_run.rs keep argv/dispatch,
argv->document translation, and presentation only;
walkforward_summary_json_from_reports now calls the public
aura_engine::param_stability instead of its inline twin.
- worked example (crates/aura-runner/examples/world_member_run.rs): a
World program runs a member backtest through the library alone.
Held quality findings, adjudicated: the plan's literal pub-visibility
list for binding.rs kept (cosmetic); ~20 refusal sites inside
aura-runner (family/member/measure/translate) still process::exit —
behaviour-identical today, conversion to RunnerError is filed forward
(refs #297); rustfmt line-width drift on re-pathed call sites left for
a repo-wide fmt decision.
Verification: cargo test --workspace green (1471 passed, 0 failed);
cargo clippy --workspace --all-targets -D warnings clean. Byte-identity
is pinned by the untouched shell E2E suites (cli_run, measure_ic,
run_measurement, research_docs, run_refuses_unrunnable_blueprint,
tap_recording — zero assertion edits).
Remaining in this cycle: full-workspace c28_layering + shell-content
check, ledger amendments (C28 assembly position, C25/C14 control-surface
consequence, C26 realization note).
refs #295
claude
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