Move the built web bundle into an embedded fabro-spa crate so Cargo and
release builds no longer depend on Bun at build time, and preserve the
local dev override path for fast UI iteration.
At the same time, rename interview and agent-level aborted flows to
interrupted, keep cancelled for run-level shutdown, and stop reporting
skipped answers as interruptions in the run event stream.
Remove leftover object-backed terminology from the worker uploader,
rename the remaining scratch-fallback test to match current behavior,
and update the old artifact upload plan to reflect the current
no-fallback model.
Move durable run access and execution control onto the server-backed client,
canonicalize run APIs under /api/v1/runs, and switch CLI integration tests
to a shared test daemon/storage model with shared-state-safe assertions.
