Every entry point wrapped `import hermes_bootstrap` in
`except ModuleNotFoundError: pass` for a partial update that left the
bootstrap unregistered. It also swallowed a module the bootstrap itself
failed to import, and since the bootstrap now owns PM activation that
silently ran the tree on stale dependencies: exactly how a pre-PM
editable venv hid its unreachable `pm` until it crashed on ruamel.
Re-raise unless the missing module is hermes_bootstrap, at all six entry
points. The stale "only Windows UTF-8 stdio suffers" comments go with it.
44f99caacd