fix(shared,risk_registry,docs): resolve issues #276 #280 #283 #343

[katefominmoore23]

#343: Fix duplicate KoraError discriminant 95 (EmptyBytes/Reentrancy)

• EmptyBytes = 97, Reentrancy = 98; NoContribution keeps 95
• Eliminates E0081 compile error and silent error misreporting
• BREAKING: clients matching Reentrancy by raw u32 must update to 98

#283: Implement verifier-delegated sub-accounts in risk_registry

• add_sub_account / remove_sub_account for primary verifiers
• resolve_verifier() resolves sub-account → primary transparently
• All SME ops by sub-accounts attributed to primary in SmeProfile.verifier
• Added get_primary_verifier() and is_sub_account() view functions
• require_verifier_primary() enforces delegation management is primary-only

#280: Add docs/storage-rent-cost-model.md

• Persistent/instance/temporary tier comparison
• TTL constants per contract with duration annotations
• Cost projections at 1k and 10k active invoices
• Keeper bot and archival responsibilities

#276: Add docs/treasury.md

• fee_bps lifecycle, whitelist model, accounting ledger
• withdraw and emergency_withdraw flow with step ordering
• Reentrancy guard design and rolling 24h rate-limit
• Two-step cap/upgrade timelock, full API table, storage layout
• Security analysis: stolen key, reentrancy, non-whitelisted token

Closes #343
Closes #283
Closes #280
Closes #276

[drips-wave]

@katefominmoore23 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits