Sequences the 18 A-scope items from docs/whisper-ecosystem/brief.md
into four phases (pre-emptive patches, engine abstraction, streaming
correctness, LLM guard) with stop-for-review boundaries between each.
Lists the new command + event contracts (#1 activeComputeDevice,
#14 list_gpus/set_preferred_gpu, #24 tentative segment flag, #28
parallel-mode toggle) that Workstream B will consume.
Co-authored-by: jars <jakejars@users.noreply.github.com>
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