`--session-id` now adopts only: an id with no stored Session fails before the
task runs instead of creating an empty history the caller believes it is
resuming. A first round omits the flag, and the runtime reports the minted
`session-<uuid>` identity in the opening `session` event, so a supervisor
persists it and names it on every later wake.
Updates the help text, the README pair, the Agent Note pair, the generated
config catalog, the unit suite, and the product-profile e2e.
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