This harness is the S0 control plane for the MVP. It first satisfies the 5/29 lifecycle foundation, then validates lifecycle transitions, tool contracts, approval gates, conversion artifacts, fixtures, and evidence records before later application phases can publish or expose game versions.

MVP Contracts

GameIR
MainCreationAgentSession
AgentTask
RequirementBrief
AIGameDesignDraft
DesignSectionPatch
DesignSection
GameLogicModule
GamePackage
AssetManifest
RuntimeSmokeEvidence
MiniGameCodeConversion
MiniGameProject
ConversionReport
ValidationReport
DevToolImportEvidence
EvidenceRecord
ChannelReadinessNote
UnpublishRequest

Foundation Contracts

PromptRecord
GameConfig
GameManifest
TelemetryEvent
LifecycleEvent
GameVersion
DistributionMetadata

Non-goals

No real application backend.
No real LLM generation.
No real channel submission.
No game runtime implementation.

Validation

Task 1 baseline validation

Run now to verify the existing 5/29 foundation harness:

node harness/scripts/validate-harness.mjs
node harness/scripts/validate-harness.mjs --check-invalid

Expected:

baseline valid fixtures pass.
baseline invalid fixtures fail with stable reasonCode.
output includes validFixtures=21 and invalidFixtures=21 unless the foundation plan is explicitly amended.

Task 1 contract index term check

Run now to verify this README names every MVP contract in the S0 index:

for term in MainCreationAgentSession AgentTask RequirementBrief AIGameDesignDraft DesignSectionPatch DesignSection GameIR GameLogicModule GamePackage AssetManifest RuntimeSmokeEvidence MiniGameCodeConversion MiniGameProject ConversionReport ValidationReport DevToolImportEvidence EvidenceRecord ChannelReadinessNote UnpublishRequest; do
  rg -q "$term" harness/README.md || { echo "missing $term"; exit 1; }
done

Expected:

exits 0 with no missing contract output.

Planned S0 validation entrypoints

These commands are the planned S0 CLI shape. Run them only after Task 2+ lands the MVP schemas, MVP fixtures, and validator CLI support; they are not Task 1 verification evidence.

node harness/scripts/validate-harness.mjs --contract GameIR --input harness/fixtures/mvp/valid/simulation-game-ir-valid.json
node harness/scripts/validate-harness.mjs --transition review_approved --input harness/fixtures/lifecycle/publish-approved-valid.json

Expected after Task 2+:

valid fixtures pass.
invalid fixtures fail with stable reasonCode.
single-contract and transition validation return { "ok": true, "reasonCode": null } or { "ok": false, "reasonCode": "..." }.