The `fabro store dump` -> `fabro dump` rename left `commands/store/` as a
vestigial directory with a stale one-line `StoreRunExport` alias. Move
`dump.rs` and `rebuild.rs` up to `commands/`, import `RunDump` directly,
rename `dump::dump_command` -> `dump::run`, and clean up stale docs and
a noise test that only asserted clap's default error output.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add a server-native run selector endpoint and migrate CLI single-run flows to
use it instead of local workflow-store heuristics. This also moves store dump
export assembly into the CLI, removes the production CLI dependency on
fabro_workflow run lookup and dump helpers, and records the remaining
cli-to-workflow coupling in an audit document.
