Distill the gap-overlay E2E findings into a staged audit plan for
the full PyQtGraph iface. Keep Qt and graphics real while replacing
feeds, services and provider search with deterministic seams.
Deats,
- define the headless PyQt6 env and pytest-qt fixture ownership;
- layer primitive, input, SHM, full-window and actor checks;
- guard window SIGINT, provider search and overlapping symbol boot;
- require signal/postcondition waits and lifecycle leak assertions;
- split reviewable PRs before distilling a repo-local UI skill.
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))
