GP1: define shadow Gate aperture and policy fixtures

[flyingrobots]

Campaign

Xyph Gate Alpha

GP0 anchor: #77
Workspace plan: /Users/james/git/profunctoroptics/DEMO.md

Goalpost 1

Define the minimum Xyph fixture vocabulary for a shadow Gate run over the first protected workflow.

This is product-shape work over fixture refs, not enforcement or UI.

Fixed campaign facts

• Protected workflow: payment_receipt_required@0
• Aperture: payment_reliability@0
• Proof-plan shape: EchoProofPlanV0
• Trace shape: TraceRunReceiptV0
• Evidence envelope: WitnessCapsuleV0
• Diff shape: HorizonDiffV0
• Obligation shape: ObligationV0
• First policy question: can capture:success happen without durable receipt obligation satisfaction?

Xyph-owned deliverables

Define fixture-level shapes for:

• aperture config for payment_reliability@0
• protected workflow mapping for payment_receipt_required@0
• policy config with ALLOW, SHADOW, BLOCK, and OVERRIDE_WITH_DEBT
• base/head HorizonDiffV0 expected output
• obligation fixture for durable_receipt_evidence_required
• expected shadow verdict for the unsafe payment path

The future command target is:

xyph gate explain-fixture payment_receipt_required@0

Acceptance criteria

• One fixture id appears across all GP1 sibling issues: payment_receipt_required@0.
• Xyph references EchoProofPlanV0, TraceRunReceiptV0, and WitnessCapsuleV0 by digest/ref.
• The first result is SHADOW, not a required merge blocker.
• Missing evidence becomes an obligation with owner/severity/TTL placeholder fields.
• The fixture vocabulary can drive GP2 without additional product terminology.

Non-goals

• No GitHub App or merge blocking.
• No Workbench UI.
• No Worker repair loop.
• No Verify product.
• No ZK verification.

Sibling issues

To be filled after GP1 sibling anchors exist.

[flyingrobots]

GP1 sibling anchors

• Continuum: GP1: define Xyph Gate Alpha evidence vocabulary fixtures continuum#78
• Edict: GP1: define EchoProofPlanV0 fixture and digest domain edict#136
• Echo: GP1: define TraceRunReceiptV0 fixture and digest domain echo#646
• Xyph: GP1: define shadow Gate aperture and policy fixtures #79

GP1 closes when these four fixtures agree on the same payment_receipt_required@0 evidence vocabulary and digest/ref story.

[coderabbitai]

🔗 Related PRs

#55 - Migrate to git-warp v15 and narrow graph read boundaries [closed]

---

📝 Issue Planner

_{Check the box below or use the @coderabbitai plan command to generate an implementation plan and prompts that you can use with your favorite coding assistant.}

• Create Plan

---

🧪 Issue enrichment is currently in open beta.

You can configure auto-planning by selecting labels in the issue_enrichment configuration.

To disable automatic issue enrichment, add the following to your .coderabbit.yaml:

issue_enrichment:
  auto_enrich:
    enabled: false

💬 Have feedback or questions? Drop into our discord!