Register core.watch before its armed notification, coalesce later changes
without losing post-notification writes, and clean up on caller death.
Observe mounted layers and open file handles, including descriptor/stream
writes, truncation, both rename paths and deletion. Track cancelled
mutations through process idle and retain visible paths across renames.
Document the protocol, expose native core discovery, and exercise watches
through SDK callbacks and raw WASI filesystem operations.
Card: SAU-359
The console reads a line, runs it to the end, and prints the result,
with and without a terminal. Notifications print while a command runs.
Ctrl-C during a command stops only the wait. 314 lines (was 480).
All host integration tests are modules of cli/tests/host/, so they run
in one parallel pool, and the probes build once. Warm, the 184 host
tests take 24 s (was about 45 s as seven binaries in sequence), and
cargo test --workspace takes 45 s.
SAU-359 implementer
surma