aura data list prints the archive's known symbols sorted, one per line
(DataServer::symbols() over the project-resolved archive root — the
discovery step before aura data coverage or scoping a campaign's
instrument matrix). An empty or absent archive prints a 'no symbols'
prose line and exits 0, per the verb corpus's empty-result register.
Pure report fn with unit tests; the headline e2e runs hostless over
the synthetic SYMA+SYMB archive.
Together with the coverage verb this closes the inventory gap: an
agent operating through the CLI alone can now discover instruments
and their per-month gaps before authoring a campaign.
closes#264
claude
5b70bd60a5