_install_owner_secret_scope / _owner_secret_scope rebuilt every owner's mapping with
build_profile_secret_scope (.env + external sources only). For the LAUNCH profile under
multiplexing the caller's bound mapping is launch_secret_scope's (frozen launch env under its
files), so a credential injected only by systemd Environment= / `op run` / Compose vanished on
the rebuild, the remote header stayed the literal ${VAR} and the new fail-closed check parked a
server that worked on main. Route the rebuild through _owner_secret_mapping: launch_secret_scope
for the process home (same rule kanban_db_dispatch applies), build_profile_secret_scope for a
served profile.
Also: retry a not-fully-hydrated home's secret sources at most once per 30 s per home instead of
on every connect/reconnect (each retry is a helper subprocess); document the remote url/headers
${VAR} fail-closed error and the scoped A2A/Buzz gates in the MCP config reference and the
multiplexing guide.
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