docs: document compliance and freeze matrix

[hpmaxi]

Summary of changes

• Add docs/COMPLIANCE_MATRIX.md defining the authoritative compliance specification across investor states (Allowlisted, De-listed, Frozen) and all 7 vault operations (request_deposit, cancel_deposit, claim_deposit, request_redeem, cancel_redeem, claim_redeem, transfer).
• Detail the exit-only cash path: once priced and covered, cash exits always pay out and are never identity-gated.
• Explicitly define deposit cancellations for de-listed investors (allowed, returning settlement asset in full).
• Explicitly define redemption cancellation for de-listed and frozen accounts (refused; cannot return shares; exit proceeds via cash claim).
• Explicitly define deposit claim behavior when de-listed after subscription request (reverts on mint, funds safely retained in escrow until resolved).
• Detail SEP-57 compliance hooks (can_transfer, can_create, can_destroy) and OpenZeppelin RWA token integration.
• Cross-reference docs/COMPLIANCE_MATRIX.md from Section 8.6 of docs/strata-product-and-architecture.md.
• Add comprehensive on-chain unit test coverage in contracts/async-vault/src/test/compliance.rs verifying all matrix transitions.

Closes #94

[vercel]

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Project	Deployment	Actions	Updated
strata-vault-kit-app	Ready	Preview	Sep 25, 2026 6:08pm UTC