pbz: Chunk 30 third review pass — read the output, not the code

Round three: a fresh regression sweep against merged Chunk 29, and a
reviewer who induced real failures on the spare and read what the CLI
actually prints. Both found things the code-level rounds could not.

From the live output: running-unsaved said the pattern "IS live on the
device" while the transport error it appends to says "it may have
rebooted" — and a reboot falsifies the claim in the same breath as
suggesting it. Past tense now, and explicit that a reboot ends it.

Also from the live output: every failure printed as one 350-580 char
run-on, because the progress line is written without a newline and the
error glues onto it, burying "error:" mid-line across several wrapped
rows. The CLI now closes an open progress line before printing.

From the regression sweep: narrowing the stored death to err.message
meant an Error with an empty message left the connection un-dead, and
let a second cause overwrite the first — which the queue's factory
closes over, so even already-parked waiters would have started getting
the wrong reason. Chunk 29 stored the object and was immune; a separate
isDead flag restores that. queue.fail() now rejects an Error where a
factory is required, instead of failing silently with nothing parked and
skipping die()'s ws.close() with something parked.

The run/save asymmetry on the same wire condition is now justified where
it lives rather than left to be rediscovered: save() can defer to the
preview frames, which are proof of rendering; run() ends at the ack.

examples/fan-out.mjs is cited as the motivation for e.device and was
still regexing prose; it now branches on the state and flags frozen
walls. New deferred item: pbz save derives the device id from the file
BASENAME, not the Name argument, so a colliding basename silently
renames an existing pattern — a reviewer hit this on real hardware.

219 tests, typecheck green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PZnUXRsLLnt2A7pR3X4Luj