feat(speckit): workflow architecture upgrades + rework 038 spec per new flow

Add prototype/openapi/validate/resume commands, wire edge-failure matrix into UX,
enforce traceability + validation gates, mandate C4/C5 belief-runtime verification.
Rework 038-dashboard-scenario-model artifacts: applicability, structured edge cases,
24-class UX state matrix, interactive HTML prototype, standardized OpenAPI 3.1 (7 ops),
full RTM with coverage gate, 56-task backlog, and PASS validation report.

.specify/templates/plan-template.md

@@ -44,9 +44,11 @@ specs/[###-feature]/
 ├── research.md          # Phase 0 output (/speckit.plan command)
 ├── data-model.md        # Phase 1 output (/speckit.plan command)
 ├── quickstart.md        # Phase 1 output (/speckit.plan command)
-├── traceability.md      # Phase 1 output — RTM: Story → Model → API → Task → Test
+├── traceability.md      # Phase 1 output — REQUIRED: Story → Screen+State → Model → API operationId → Contract → Task → Test
 ├── contracts/           # Phase 1 output (/speckit.plan command)
 │   ├── modules.md       # Module & function contracts
+│   ├── openapi.yaml     # OpenAPI 3.1 spec (if /speckit.openapi was run)
+│   ├── openapi-traceability.md  # OpenAPI drift map (if /speckit.openapi was run)
 │   └── ux/              # UX contracts (if /speckit.ux was run)
 │       ├── alternatives.md  # Design space explored
 │       ├── decisions.md     # Final UX choices
@@ -54,6 +56,10 @@ specs/[###-feature]/
 │       ├── api-ux.md        # API interaction shapes
 │       ├── <screen>-ux.md   # Per-screen UX contracts
 │       └── design-tokens.md # Applied tokens & reuse
+├── prototype/           # Interactive HTML prototype (if /speckit.prototype was run)
+│   ├── index.html       # Self-contained interactive prototype
+│   └── manifest.md      # Prototype state coverage & validation
+├── validation.md        # Pre-implementation validation gate (/speckit.validate command)
 └── tasks.md             # Phase 2 output (/speckit.tasks command)
 ```