Salvage follow-up to #107955 (Alex Tu) and #109494 (EloquentBrush0x):
- _default_profile_secret_scope: drop the import try/except, the
current_secret_scope() short-circuit and the build-failure fallthrough.
The tick always runs in a fresh Context (no scope can be present) and a
failure to build the launch profile scope must surface, not silently
degrade to an unscoped tick.
- Regression test proven red on origin/main: run the real
auto_decompose_tick through _to_thread_process_service under multiplex
and assert the decomposer reads the launch profile .env value; ports the
contract from #57837 (srojk34) to the post-refactor dispatcher.
- Trim the #109494 test docstring to the invariant.
teknium1
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