- build_update_products builds only the frontends the checkout carries; a
python-only slice (the installer's acceptance fixture) publishes commands
and runs maintenance without asking PM for node.
- stderr_timestamp.py is a launcher boot file copied into published
commands; it inlines the EX_CONFIG code instead of importing gateway.restart.
- Tests: the stamp-writer slice gains hermes_cli/release_channels.py and
pm/paths.py (the modules update_channel now imports); the source-launch
fixture records the source_completion hand-off (--finish-update) instead
of building products; the stdlib recovery probe blocks PM's engine
modules, not the pm.environments boot leaf; the memory-provider restart
test selects a generation the running interpreter has not activated;
the warm-path installer stage is `products`.
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