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gsxdsm e72629c251 FN-8126: add per-task merger model controls

Enable Quick Add and task editing to select merger models and thinking levels.

- Persist merger model and thinking overrides through task APIs, storage, and PostgreSQL migrations.
- Add merger-lane selection controls to Quick Add and model settings interfaces.
- Apply task merger settings to merger and PR fallback sessions, with regression coverage.
- Document the merger lane and include a release changeset.

Files changed:
 .changeset/fn-8126-quick-add-merger-lane.md        |   7 ++
 docs/dashboard-guide.md                            |   2 +
 docs/settings-reference.md                         |   7 +-
 .../core/src/__tests__/model-resolution.test.ts    |   9 ++
 packages/core/src/index.gate.ts                    |   1 +
 packages/core/src/index.ts                         |   1 +
 packages/core/src/model-resolution.ts              |  20 ++++
 .../core/src/postgres/migrations/0000_initial.sql  |   3 +
 .../migrations/0017_task_merger_model_lane.sql     |   4 +
 packages/core/src/postgres/schema-applier.ts       |  14 ++-
 packages/core/src/postgres/schema/project.ts       |   3 +
 packages/core/src/store.ts                         |   2 +-
 .../core/src/task-store/archive-lifecycle-2.ts     |   6 ++
 packages/core/src/task-store/persistence.ts        |   6 ++
 packages/core/src/task-store/remaining-ops-2.ts    |   4 +-
 packages/core/src/task-store/remaining-ops-6.ts    |   2 +-
 packages/core/src/task-store/serialization.ts      |   6 ++
 packages/core/src/task-store/task-creation.ts      |   6 ++
 packages/core/src/task-store/task-row-mappers.ts   |   4 +-
 packages/core/src/task-store/task-update.ts        |   6 ++
 packages/core/src/types.ts                         |  18 ++++
 packages/dashboard/app/api/tasks.ts                |  13 +++
 .../dashboard/app/components/InlineCreateCard.tsx  |  33 ++++++-
 .../app/components/ModelSelectionModal.tsx         |  29 ++++++
 .../dashboard/app/components/ModelSelectorTab.tsx  | 101 +++++++++++++++++++--
 .../dashboard/app/components/QuickEntryBox.tsx     |  44 +++++++--
 .../__tests__/ModelSelectionModal.test.tsx         |  20 ++++
 .../components/__tests__/ModelSelectorTab.test.tsx |  37 +++++++-
 .../src/routes/register-task-workflow-routes.ts    |  27 +++++-
 .../src/__tests__/agent-session-helpers.test.ts    |   8 ++
 packages/engine/src/agent-session-helpers.ts       |  16 +++-
 packages/engine/src/merger-ai.ts                   |  14 +--
 packages/engine/src/merger.ts                      |  35 ++++---
 packages/engine/src/pr-response-run-ops.ts         |   7 +-
 34 files changed, 451 insertions(+), 64 deletions(-)

Fusion-Task-Id: FN-8126

Fusion-Task-Lineage: 3fc81801-6d77-4e11-9cf0-3af37313930e

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

2026-07-16 21:07:06 -07:00