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FN-5768: add dual-observe workflow parity instrumentation

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Add default-off workflow interpreter dual-observe parity instrumentation across core and engine.

- add workflow parity comparison primitives and exports in @fusion/core
- add engine parity observer seam with experimental flag and public exports
- add regression coverage for parity contracts and dual-observe reliability behavior
- document the dual-observe parity mode, events, and contract in workflow docs
- add a patch changeset for @runfusion/fusion release notes

Files changed:
 .changeset/fn-5768-workflow-parity-observer.md     |   9 +
 docs/workflow-steps.md                             |  18 ++
 .../core/src/__tests__/workflow-parity.test.ts     | 143 ++++++++++++++
 packages/core/src/index.ts                         |  18 ++
 packages/core/src/workflow-parity.ts               | 205 +++++++++++++++++++++
 .../workflow-interpreter-dual-observe.test.ts      | 144 +++++++++++++++
 packages/engine/src/index.ts                       |   7 +
 packages/engine/src/workflow-parity-observer.ts    | 116 ++++++++++++
 8 files changed, 660 insertions(+)

Fusion-Task-Id: FN-5768

Fusion-Task-Lineage: fb4f8111-f48d-482c-b1d9-9106c43c829a
This commit is contained in:
gsxdsm
2026-05-31 07:55:18 -07:00
parent 5c33ab133e
commit 5b4eecb5d4
8 changed files with 660 additions and 0 deletions
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.changeset/fn-5768-workflow-parity-observer.md Normal file
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---
"@runfusion/fusion": minor
---
Add workflow interpreter dual-observe parity instrumentation surfaces for phased rollout.
- Export pure workflow parity comparison helpers from `@fusion/core` (`compareWorkflowRunObservations`, `compareWorkflowRunAudits`) with structured drift reports.
- Add `observeWorkflowParity` in the engine as a default-OFF, fail-soft observer gated by `experimentalFeatures.workflowInterpreterDualObserve`.
- Emit run-audit parity events (`workflow:parity-observed`, `workflow:parity-drift`) for shadow agreement/drift visibility without changing authoritative legacy execution.