Library.close() now returns a promise that resolves once the work it
started has finished: an in-flight refresh with its cache write, the ML
data fetch, and running precache sweeps. The interval test could see a
refresh's new state, close, and remove the directory while the write was
still running. Every library test and CLI command now awaits close(), and
tests hold each of the three writes open to prove close() waits for it.
The precache test waited for its stub source to be called, but the cache
records a file only after checking it on disk, so status() could lag. It
now waits for both fills to report "done".
Model: opus-5-5
The command bodies in bin/quak.ts become functions in
src/cli-commands.ts that take their options and a context (output
streams, session directory, cache directory, session loader) and return
an exit code. bin/quak.ts wires them to commander and exits with that
code once stdout and stderr have drained; nothing below it calls
process.exit. test/cli/commands.test.ts drives the commands with a fake
client and temp directories. Output is unchanged.
Model: opus-5-5
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