Add an archive inventory verb #264
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Reference: Brummel/Aura#264
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No CLI verb enumerates what the recorded archive contains; instruments and their m1 coverage are discoverable only by listing the archive directory outside aura (the built-in root,
DEFAULT_DATA_PATHin the data-server crate). Campaign authoring — instrument matrices, window bounds, cross-instrument generalization — depends on exactly that inventory, and an agent operating through the CLI alone (the deployment posture) has no way to obtain it.a895891already derives archive bounds from the monthly file index; a thinaura data list(symbols) andaura data coverage <symbol>(first/last month, gaps) over the same index would close the gap headlessly.Concrete failure illustrating the gap: a 22-instrument campaign (8.5-y window from 2018-01-01) aborted mid-run with
aura: no data for instrument Copper in window [1514764800000, 1522540799999]— the Copper archive has monthly files from 2016-08 but is missing 2018-01 through 2018-10, so a first/last-file coverage check passes while the window start has no data. The abort came ~6.7 minutes in and discarded the ~36 already-computed cells; the three-tier validate cannot catch it because the executable tier is data-free by design. A coverage verb reporting per-symbol month gaps (not just bounds) would have caught this before the run.