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gsxdsm 62c4aae038 FN-7358: recover Sonnet 5 chat fallbacks

Recover Sonnet 5 chat sends by applying configured fallback models and clearer failure context.

- Allow explicit dashboard chat model selections to use the configured fallback on retryable provider/model failures.
- Preserve selected provider/model context in no-fallback chat errors so operators can identify unavailable models.
- Expand provider not-found detection and regression coverage for Anthropic Sonnet 5 404 payloads.
- Document fallback behavior and add the published package changeset.

Files changed:
 .changeset/fn-7358-sonnet-5-response-failed.md     |  7 +++
 docs/settings-reference.md                         |  2 +-
 .../dashboard/src/__tests__/chat-manager.test.ts   | 71 +++++++++++++++++++---
 packages/dashboard/src/chat.ts                     | 67 +++++++++++++++++---
 packages/engine/src/__tests__/pi.test.ts           | 71 +++++++++++++++++++++-
 .../src/__tests__/transient-error-detector.test.ts |  4 ++
 packages/engine/src/pi.ts                          |  4 +-
 packages/engine/src/transient-error-detector.ts    |  4 +-
 8 files changed, 208 insertions(+), 22 deletions(-)

Fusion-Task-Id: FN-7358

Fusion-Task-Lineage: 095a3218-1d4a-4ccb-a8c9-c9f81822b084

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

2026-07-01 07:33:56 -07:00