[WIP] Establish tracking for integrity foundations and risk matrix

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Phase 1] P0 Integrity Foundations Tracking & Risk Matrix</issue_title>
<issue_description>## Priority: P0 (Meta)
Phase: 1 - E-Commerce Core
Type: Tracking / Meta Issue

Purpose

Central tracker for all foundational integrity/security/performance P0 issues introduced to correct roadmap gaps and reduce composite risk score before Phase 2 expansion.

Included P0 Issues

• PaymentAttempt & PaymentTransaction State Machine ([Phase 1] PaymentAttempt & PaymentTransaction State Machine #63)
• Inventory Reservation & Hold System ([Phase 1] Inventory Reservation & Hold System #64)
• Idempotency Key & Replay Safety ([Phase 1] Idempotency Key & Request Replay Safety Layer #66)
• RBAC & Scoped API Tokens ([Phase 1] RBAC & Scoped API Tokens (Multi-Tenant Authorization) #67)
• Cache Tags & ProductSummary Strategy ([Phase 1] Cache Tags & ProductSummary Denormalization Strategy #68)
• Webhook Infrastructure & Delivery Guarantees ([Phase 1] Webhook Infrastructure & Delivery Guarantees #69)
• Observability Baseline (Logging & Metrics) ([Phase 1] Observability Baseline (Structured Logging & Metrics) #70)
• Rate Limiting & Throttling Controls ([Phase 1] Rate Limiting & Throttling Controls #71)
• Refund & Return Workflow Primitives ([Phase 1] Refund & Return Workflow Primitives #72)

Risk Scoring Model (Composite)

Score = Impact(1-5) + Integrity(1-5) + Financial(1-5) + Blockage(1-5)
Threshold: >15 flagged as critical. All above exceed or meet threshold.

Domain	Impact	Integrity	Financial	Blockage	Composite
Payments State Machine	5	5	5	4	19
Inventory Reservation	4	5	4	3	16
Idempotency	5	5	4	3	17
RBAC & API Tokens	4	5	3	4	16
Cache Tags & Summary	3	4	3	5	15
Webhooks Infrastructure	4	4	3	5	16
Observability Baseline	4	4	3	4	15
Rate Limiting	4	4	4	4	16
Refund & Return	5	4	5	3	17

Execution Order (Recommended)

1. [Phase 1] PaymentAttempt & PaymentTransaction State Machine #63 Payments State Machine
2. [Phase 1] Idempotency Key & Request Replay Safety Layer #66 Idempotency
3. [Phase 1] Inventory Reservation & Hold System #64 Inventory Reservation
4. [Phase 1] RBAC & Scoped API Tokens (Multi-Tenant Authorization) #67 RBAC & API Tokens
5. [Phase 1] Rate Limiting & Throttling Controls #71 Rate Limiting
6. [Phase 1] Webhook Infrastructure & Delivery Guarantees #69 Webhook Infrastructure
7. [Phase 1] Observability Baseline (Structured Logging & Metrics) #70 Observability Baseline (metrics expose earlier results)
8. [Phase 1] Cache Tags & ProductSummary Denormalization Strategy #68 Cache Tags & ProductSummary
9. [Phase 1] Refund & Return Workflow Primitives #72 Refund & Return

Success Metrics (Aggregated)

• Zero oversell incidents after [Phase 1] Inventory Reservation & Hold System #64 live
• Zero duplicate charge/order incidents after [Phase 1] Idempotency Key & Request Replay Safety Layer #66
• 100% role/scope enforcement for privileged ops after [Phase 1] RBAC & Scoped API Tokens (Multi-Tenant Authorization) #67
• p95 product list latency improvement >30% after [Phase 1] Cache Tags & ProductSummary Denormalization Strategy #68
• 95% first-attempt webhook success after [Phase 1] Webhook Infrastructure & Delivery Guarantees #69
• Log coverage ≥90% for domain actions after [Phase 1] Observability Baseline (Structured Logging & Metrics) #70
• Rate limiting blocks ≥95% of abuse bursts after [Phase 1] Rate Limiting & Throttling Controls #71
• Accurate cumulative refund tracking (no over-refund) after [Phase 1] Refund & Return Workflow Primitives #72

Reporting Cadence

• Weekly summary comment: status of each issue (Open / In Progress / Merged / Deferred)
• Add checklist below to update

Checklist

• [Phase 1] PaymentAttempt & PaymentTransaction State Machine #63 Complete
• [Phase 1] Inventory Reservation & Hold System #64 Complete
• [Phase 1] Idempotency Key & Request Replay Safety Layer #66 Complete
• [Phase 1] RBAC & Scoped API Tokens (Multi-Tenant Authorization) #67 Complete
• [Phase 1] Cache Tags & ProductSummary Denormalization Strategy #68 Complete
• [Phase 1] Webhook Infrastructure & Delivery Guarantees #69 Complete
• [Phase 1] Observability Baseline (Structured Logging & Metrics) #70 Complete
• [Phase 1] Rate Limiting & Throttling Controls #71 Complete
• [Phase 1] Refund & Return Workflow Primitives #72 Complete

Dependencies & Links

See individual issue bodies for schema drafts and acceptance tests.

References

• docs/GITHUB_ISSUES_COMPARISON_ANALYSIS.md
• Risk matrix rationale discussion
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Phase 1] P0 Integrity Foundations Tracking & Risk Matrix #73

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