save checkpoint: save features

docs/features/checked/platform/platform-setup-wizard-backend-api.md

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+# Platform Setup Wizard Backend API
+
+## Module
+Platform
+
+## Status
+VERIFIED
+
+## Description
+Real /api/v1/setup/* endpoints replacing UI mocks with deterministic session state (create, resume, execute, skip, finalize), tenant scoping, and offline-first "data as of" metadata.
+
+## Implementation Details
+- **SetupEndpoints**: `src/Platform/StellaOps.Platform.WebService/Endpoints/SetupEndpoints.cs` -- REST API at `/api/v1/setup` with 3 endpoint groups: sessions (GET current, POST create, POST resume, POST finalize), steps (POST execute, POST skip), definitions (GET step definitions); AllowAnonymous during initial setup, requires auth after completion
+- **SetupStateDetector**: detects setup completion state from storage/DB settings; routes between bootstrap context and authenticated context
+- **PlatformSetupService**: service layer for setup wizard operations (CreateSessionAsync, ResumeOrCreateSessionAsync, ExecuteStepAsync, SkipStepAsync, FinalizeSessionAsync, GetStepDefinitionsAsync)
+- **SetupWizardModels**: `src/Platform/StellaOps.Platform.WebService/Contracts/SetupWizardModels.cs` -- request/response models (CreateSetupSessionRequest, SetupSessionResponse, ExecuteSetupStepRequest, SkipSetupStepRequest, FinalizeSetupSessionRequest, FinalizeSetupSessionResponse, SetupStepDefinitionsResponse)
+- **Problem+JSON errors**: all endpoints return RFC 7807 ProblemDetails on errors
+- **Source**: SPRINT_20260112_004_PLATFORM_setup_wizard_backend.md
+
+## E2E Test Plan
+- [ ] Verify setup session creates with bootstrap context when auth is unavailable
+- [ ] Test session resume returns existing session or creates new one
+- [ ] Verify step execution updates session state correctly
+- [ ] Test step skip marks step as skipped and advances session
+- [ ] Verify finalize completes setup and subsequent requests require authentication
+- [ ] Test step definitions endpoint returns all available setup steps
+
+## Verification
+- Verified on 2026-02-11 with run-001 Tier 0/1/2 evidence.
+- Tier 1 build/test pass: platform webservice + platform webservice tests (100/100).
+- Tier 2 setup API behavior checks pass (7/7 setup-focused class tests) covering create/resume/execute/skip/finalize/definitions and required-step skip negative path.
+- Evidence:
+  - `docs/qa/feature-checks/runs/platform/platform-setup-wizard-backend-api/run-001/tier0-source-check.json`
+  - `docs/qa/feature-checks/runs/platform/platform-setup-wizard-backend-api/run-001/tier1-build-check.json`
+  - `docs/qa/feature-checks/runs/platform/platform-setup-wizard-backend-api/run-001/tier2-api-check.json`
+