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gsxdsm 13f7266b67 FN-8670: reuse model runtime fixtures in engine tests

Share a warmed Pi model runtime across engine catalog tests.

- Add an isolated in-memory model registry fixture backed by a per-file shared runtime.
- Warm the runtime before catalog tests and verify custom-provider registry isolation.
- Document the required fixture pattern for real Pi SDK catalog tests.

Files changed:
 docs/testing.md                                    |  1 +
 .../engine/src/__tests__/_model-runtime-fixture.ts | 40 ++++++++++++++++++++++
 .../custom-providers-openai-completions.test.ts    | 15 +++-----
 .../custom-providers-openai-responses.test.ts      | 15 +++-----
 .../src/__tests__/provider-registration.test.ts    | 33 ++++++++++++------
 5 files changed, 73 insertions(+), 31 deletions(-)

Fusion-Task-Id: FN-8670

Fusion-Task-Lineage: 7410d114-1853-44cc-a09b-a997fbc7f119

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-01 01:34:43 -07:00