feat(FN-3905): use merger session model for post-merge workflow steps

The merge implements post-merge model resolution, using the merger's own session model for executing post-merge prompt workflow steps instead of falling back to executor model defaults. Tests cover the resolution hierarchy, and documentation clarifies the precedence order for downstream consumers.

Fusion-Task-Id: FN-3905
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Fusion
2026-05-11 09:19:57 -07:00
committed by gsxdsm
parent 2f0fb24199
commit b56306c422
13 changed files with 379 additions and 46 deletions

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@@ -530,6 +530,8 @@ When heartbeat has both (1) and (2-5), the runtime model is used as primary and
3. Global `defaultProvider` + `defaultModelId`
4. Automatic provider/model resolution
For post-merge prompt workflow steps, explicit step-level `modelProvider` + `modelId` overrides take precedence over the merger lane above.
### Title summarization model
Used for task title auto-summarization and (when enabled) AI merge commit summaries.