Import the source-equivalent EMS code and its original wrapper
regression. `clear_dark_triggers()` owns a non-strict child from
`quote_stream.subscribe()` for the lifetime of its clearing loop,
instead of changing a shared receiver's private lag policy.
LOCAL ADDITION,
Add a second regression using the production clearing loop and a
real broadcaster. Deliver a tick to EMS and a sibling, cancel EMS,
and prove the sibling remains usable with strict lag policy.
No order trigger or live broker is involved in this test.
Downstream replay,
The EMS code has the source patch's stable patch ID. The test file
also contains the local real-broadcaster case, so the complete
commit is not patch-identical. Preserve that extra coverage when
reconciling an already-applied EMS delta.
Backport-of: 12b0d66e85
Source-author: goodboy <goodboy_foss@protonmail.com>
Prompt-IO: ai/prompt-io/opencode/20261022T212248Z_dc618229_ib_recovery_prompt_io.md
(this patch was generated in some part by `opencode` using
`gpt-6-astra` (`openai`))
Gud Boi