### Fixed

- The sweep's `bootstrap` value crosses the `workflow_call` boundary as a
  declared input, explicitly passed by the caller — the one channel measured
  to work; the called workflow did not see the caller's event inputs as an
  implicit substitute on this instance (#215).

- Before the bridge, `github.event.inputs` was empty inside the called
  workflow, so every dispatch-woken sweep bootstrapped: ~20 label upserts on
  each board event (#215).

- The caller maps an empty top-level value to `no` explicitly, so a
  cron-woken sweep can never bootstrap; the declared input also defaults to
  `no`, so a consumer that passes nothing gets the safe path (#215).

- The gate feeds the declared input to `labels-reconcile` unchanged, so an
  invalid value meets the action's own `yes|no` refusal instead of being
  silently coerced (#215).

- `docs/CONSUMERS.md`'s published sweep stub carries the same pass-through —
  without it every consumer inherits the defect ceremony fixed for
  itself (#215).

### Added

- `test/labels-bootstrap.test.sh` pins the bridge at every hop: the declared
  boundary, both gate sites as the identity, no expression reading
  `github.event.inputs`, and the caller and stub pass-throughs
  byte-exact (#215).

- The same test drives the four value paths — schedule-empty, `no`, `yes`,
  invalid — through the shipped expressions into the action's real
  validator (#215).

- The taxonomy bootstrap keys on the `BOOTSTRAP` input, never the event name.
  It tested `GITHUB_EVENT_NAME = workflow_dispatch` — correct while an
  operator's manual dispatch was the only dispatch there was, inert-by-
  construction from #209 on, when every machine wake became a dispatch
  event (#215).

- The venue drill caught that: with the bridge delivering `no` perfectly,
  drill runs 16/17 still bootstrapped, because the script never read the
  input the whole chain existed to deliver (#215).

- `test/labels-reconcile.test.sh` pins the regression pair exactly: a
  `workflow_dispatch` event with `BOOTSTRAP=no` (or unset) creates and
  deletes nothing; only `BOOTSTRAP=yes` bootstraps (#215).