Second W1 gate, same staged execution as S7 (operator-chosen): cheap live
feasibility probe + design doc; the prose-vs-Workflow bake-off specified but
NOT run.
Probe (CC 2.1.181 interactive): a minimal trekreview-shaped Workflow —
parallel([reviewerA, reviewerB]) with a findings schema -> agent(coordinator)
with a verdict schema — ran end-to-end. F1 core ports natively; F2 structured
schemas retire the JSON-parse fragility at trekreview.md:202-204; F3 result
returns to main; F4 a small purposeful fan-out did NOT trip the S7 proliferation
classifier. 3 agents / 85461 tokens / 13.8s.
Reframe: 'substrate swap' is a false binary — a /trek* command is ~80%
non-orchestration glue, so Workflow can only replace the fan-out->synthesize
core (hybrid).
CC-27 recommendation (operator gates verdict): selective hybrid, NOT wholesale
swap. Tier 1 ship a prose schema contract (the F2 win, no Workflow dep); tier 2
port trekreview Phase 5-6 to a Workflow only if the designed bake-off shows
fidelity-equivalent output + acceptable control/cost; tier 3 wholesale swap
declined (portability floor 2.1.154+, opt-in UX, mid-flow visibility loss).
Open risk inherited from S7: classifier at large fan-out under auto/bypass
still unverified.
New: docs/T2-cc27-workflow-substrate.md (gate evidence F0-F4 + bake-off design
with thresholds + no-Workflow schema-contract PoC). Matrix: CC-27 row +
S8 resolutions + open-question/T2 pointers updated. Docs-only; no code/schema.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LqBYc8Ltrk7LipyJmGxXiB
Kjell Tore Guttormsen
b5f3d4a932