Brummel
d309336a72
Cycle D of the milestone "The World — parameter-space & sweep" (#33). A persistent, append-only run registry: each run's (manifest, metrics) is a record in runs/runs.jsonl; a read surface lists all records and ranks them best-first by a named metric — C18's "compare experiments over time", which has no home in git or Gitea. First cut = persist + list + rank; promotion/ status, lineage, run-diff, on-demand re-derivation, run_id, and Aura.toml runs-dir wiring are deferred. Contract-level change: C16's blanket "zero-external-dependency by commitment" is amended to a considered, per-case dependency policy (scrutinize what enters the frozen artifact; standard vetted crates like serde/rayon pass that review; never hand-roll what they do). The engine/project split + three-tier node reuse of C16 are unchanged. This admits serde/serde_json — the typed read-path ranking needs, and which closes #17 (typed RunReport handle). Shape: serde derives on RunManifest/RunMetrics/RunReport + Timestamp; SweepPoint carries a full RunReport (closing the manifest-per-point gap cycle C deferred to #33); new crate aura-registry (open/append/load/rank_by); CLI gains aura runs list / aura runs rank <metric> and aura sweep persists each point. Three iterations, first planner handoff = iteration 1 (foundation). Sign-off: spec_auto_sign was enabled for this cycle; the five-lens spec-skeptic panel returned 3 SOUND + 2 BLOCK (rank-ordering semantics; iteration-cut compile-ordering + Scalar->f64 coercion). Both BLOCKs were genuine defects, fixed before sign-off (rank is now best-first per-metric; the closure-type change lands with its callers in one green iteration; the coercion is shown). Non-unanimous panel routed the spec to human sign-off, granted by the user. refs #33