document gstack 2 evidence and blocked gates

docs/gstack-2/SCENARIOS.md

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+# GStack 2 routing scenarios
+
+The 25 executable fixtures route from structured stage/surface/authorization/evidence signals. Their prompts intentionally avoid public skill and mode names.
+
+| ID | Expected decision | Active | Mutation | Evidence basis | Gap |
+|---|---|---|---|---|---|
+| `idea-before-solution` | `plan:Discovery` | `office-hours` | `design-doc-only` | phase=pre-solution; premise_confidence=low | — |
+| `scope-and-ambition` | `plan:Product` | `plan-ceo-review` | `plan-only` | artifact_exists=true; uncertainty=scope-strategy | — |
+| `architecture-data-contracts` | `plan:Engineering` | `plan-eng-review` | `plan-only` | uncertainty=architecture-data; phase=implementation-design | — |
+| `developer-first-onboarding` | `plan:DX` | `plan-devex-review` | `plan-only` | audience=developers; journey=onboarding | — |
+| `cross-functional-decision` | `plan:Full chain` | `autoplan` | `plan-only` | review_axes_count=4; automatic_decisions=true | — |
+| `backlog-ready-handoff` | `plan:Specification` | `spec` | `spec-and-issue` | output=executable-backlog-item; phase=handoff | — |
+| `new-visual-system` | `design:Generate` | `design-consultation` | `design-artifacts` | surface=design-system; implementation_exists=false | — |
+| `compare-directions` | `design:Explore` | `design-shotgun` | `design-artifacts` | alternatives_requested=true; output=comparison | — |
+| `coded-marketing-surface` | `design:Implement` | `design-html` | `design-artifacts` | output=html-css; runtime_verification=true | — |
+| `prebuild-interface-critique` | `design:Critique` | `plan-design-review` | `plan-only` | implementation_exists=false; artifact_exists=true | — |
+| `implemented-interface-audit` | `design:Implement` | `design-review` | `fix-safe` | implementation_exists=true; mutation_authorized=true | — |
+| `real-device-hig-audit` | `design:Critique` | `ios-design-review` | `report-only` | surface=ios; real_device=true | — |
+| `browser-findings-only` | `qa:Report` | `qa-only` | `report-only` | surface=web; mutation_authorized=false | — |
+| `browser-fix-and-verify` | `qa:Fix` | `qa` | `fix-safe` | surface=web; mutation_authorized=true | — |
+| `device-state-journey` | `qa:Report` | `ios-qa` | `report-only` | surface=ios; real_device=true | — |
+| `cli-api-journey` | `qa:Report` | `devex-review`, `qa-only`, `investigate`, `system-functional` | `report-only` | surface=developer-workflow; journey_measurement=true; functional_backend_harness=true | — |
+| `measured-page-regression` | `qa:Report` | `benchmark` | `report-only` | measurement=performance; baseline_exists=true | — |
+| `production-threshold-watch` | `qa:Report` | `canary` | `report-only` | deployed=true; thresholds_declared=true | — |
+| `unknown-intermittent-cause` | `debug:Diagnose-only` | `investigate` | `investigate-only` | cause_known=false; intermittent=true | — |
+| `reproducible-device-defect` | `debug:Fix` | `ios-fix` | `fix-safe` | platform=ios; reproducible=true | — |
+| `ci-script-change-review` | `review:Normal` | `review` | `fix-safe` | change_exists=true; audit_focus=broad | — |
+| `threat-surface-audit` | `review:Security` | `cso` | `report-only` | audit_focus=security; threat_model_required=true | — |
+| `branch-to-pull-request` | `ship:Prepare` | `ship` | `commit-push-pr` | release_stage=working-branch; pr_exists=false | — |
+| `approved-change-to-production` | `ship:Land` | `land-and-deploy` | `merge-deploy` | release_stage=approved-pr; deploy_requested=true | — |
+| `post-release-doc-alignment` | `ship:Prepare` | `document-release` | `docs-only` | release_stage=post-ship; docs_drift=true | — |