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gsxdsm 5ce3a973e6 FN-8902: bound and cache model registry refreshes

Bound model-catalog refreshes so requests retain available models when providers stall.

- Add timeout-bounded, single-flight engine registry refreshes with fallback model retention.
- Cache refresh outcomes per registry and invalidate them after all credential mutations, including default-instance changes.
- Cover refresh cache and route behavior, and document the resilience contract.

Files changed:
 .changeset/fn-8902-models-refresh-bounding.md      |   7 +
 docs/dashboard-guide.md                            |   6 +
 .../__tests__/model-registry-refresh-cache.test.ts |  77 +++++++
 .../register-model-routes-refresh-bounding.test.ts | 246 +++++++++++++++++++++
 .../dashboard/src/model-registry-refresh-cache.ts  | 153 +++++++++++++
 packages/dashboard/src/routes.ts                   |   5 +
 .../dashboard/src/routes/register-auth-routes.ts   |  24 +-
 .../dashboard/src/routes/register-model-routes.ts  |  12 +-
 .../src/__tests__/model-registry-refresh.test.ts   |  33 +++
 packages/engine/src/auth/model-registry-refresh.ts | 125 +++++++----
 packages/engine/src/index.ts                       |   3 +
 11 files changed, 642 insertions(+), 49 deletions(-)

Fusion-Task-Id: FN-8902

Fusion-Task-Lineage: 9f0eaf34-6d28-49aa-b065-274be14ea500

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

2026-08-11 19:00:44 -07:00