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gsxdsm 039d3ce440 FN-6236: move fast triage into workflow settings

Move fast triage prompting into the workflow/settings prompt model.

- Add a core-owned fast triage prompt and expose the workflow prompt mode type.
- Add a fast-mode builtin workflow variant and route triage prompt selection through workflow settings.
- Remove the engine-local fast triage prompt constant and update triage tests for workflow-driven fast mode.
- Document the fast triage prompt mode setting and add a patch changeset.

Files changed:
 .changeset/FN-6236-fast-mode-workflow-variant.md   |   7 +
 docs/settings-reference.md                         |   2 +
 packages/core/src/__tests__/agent-prompts.test.ts  |  16 +-
 .../builtin-workflow-settings-triage.test.ts       |   5 +
 packages/core/src/agent-prompts.ts                 | 221 +++++++++++++++++++
 packages/core/src/builtin-workflow-prompts.ts      |  12 +-
 packages/core/src/builtin-workflow-settings.ts     |  18 +-
 packages/core/src/index.ts                         |   5 +
 packages/core/src/types.ts                         |   4 +
 .../triage-duplicate-search-regression.test.ts     |  18 +-
 .../triage-fast-mode-workflow-variant.test.ts      | 219 +++++++++++++++++++
 .../triage-planning-prompt-single-source.test.ts   |   8 +-
 packages/engine/src/__tests__/triage.test.ts       |  64 +++---
 packages/engine/src/triage.ts                      | 235 ++-------------------
 14 files changed, 565 insertions(+), 269 deletions(-)

Fusion-Task-Id: FN-6236

Fusion-Task-Lineage: 369954d8-41e7-4d88-aa6d-e6bbca077d50

2026-06-12 14:39:51 -07:00