The roots are an assembly fact (the shipped set beside this app's config,
the user's own under $DSH_HOME) but only `dsh web` patched them in, so the
merged `dsh run` booted the roster with no roots and failed resolving
`standard`. The shared profile boot now owns the patch for every launcher;
the one-shot transcript header consequently records its composing preset,
and master's interrupt_agent tool joins the standard composition's exact
catalog.
