FN-6607: align step tools with zero-based prompt steps
Align executor step tools and review bookkeeping with the 0-based Step N labels agents see in PROMPT.md.
- Treat fn_task_update and fn_review_step step parameters as 0-indexed values, including validation, logs, checkpoints, and review verdict maps.
- Update executor/reviewer/step-runner guidance and generated tool docs to describe Step 0 semantics consistently.
- Adjust affected executor and reliability tests and add coverage proving Step 0 progress, review, and revise handling work without off-by-one shifts.
- Add a patch changeset for the published Fusion CLI package.
Files changed:
.changeset/fn-6607-step-numbering.md | 5 +
.../cli/skill/fusion/references/engine-tools.md | 4 +-
.../engine/src/__tests__/executor-pause.test.ts | 2 +-
.../executor-review-step-indexing.test.ts | 18 +-
.../src/__tests__/executor-review-verdicts.test.ts | 18 +-
.../executor-step-numbering-zero-based.test.ts | 196 +++++++++++++++++++++
.../src/__tests__/executor-step-session.test.ts | 24 ++-
...executor-task-done-revise-verdict-guard.test.ts | 4 +-
.../executor-pending-review-skip-retry.test.ts | 8 +-
.../task-done-refusal-x-invariant.test.ts | 2 +-
packages/engine/src/__tests__/step-runner.test.ts | 4 +-
packages/engine/src/executor.ts | 57 +++---
packages/engine/src/reviewer.ts | 3 +
packages/engine/src/step-runner.ts | 6 +-
14 files changed, 284 insertions(+), 67 deletions(-)
Fusion-Task-Id: FN-6607
Fusion-Task-Lineage: 1b1fb1d8-07ca-4a33-84f5-1dab83388c01
a013bc0309