feat: add invoice compliance attestation system (#879)

[jacobjacobb4242]

Issue #879 — Add invoice compliance attestation system

Adds a new compliance_attest_ext.rs module that implements a structured,
admin-gated compliance record system for invoices.

Core functionality

Admin management:

• register_compliance_officer(admin, officer) — adds an officer to the approved set.
• remove_compliance_officer(admin, officer) — removes an officer.
• is_compliance_officer(officer) — read-only membership check.

Record submission:

• submit_compliance_record(officer, invoice_id, framework, passed, notes) — registered officers submit compliance attestations.
  • framework is a short identifier ("KYC", "AML", "GDPR", …) capped at 32 bytes.
  • notes is an optional free-form string capped at 512 bytes.
  • One record per officer per framework per invoice (duplicates rejected).
  • Max 10 records per invoice.
• get_compliance_records(invoice_id) — returns all records (read-only).

Events

Topic	Data
(split, co_add)	officer
(split, co_rem)	officer
(split, cmp_sub, invoice_id)	(officer, framework, passed)

Storage

Local ComplianceAttestKey enum:

• Records(invoice_id) — Vec<ComplianceRecord> in persistent storage.
• Officers — Vec<Address> in instance storage.

New type

ComplianceRecord { officer, framework, passed, notes, timestamp }

Tests

7 unit tests:

• Register and check officer
• Remove officer
• Submit and read record
• Non-officer cannot submit
• Duplicate framework per officer rejected
• Non-admin cannot register officer
• Multiple officers / multiple frameworks on same invoice

Files changed

File	Change
contracts/split/src/compliance_attest_ext.rs	New
contracts/split/src/lib.rs	Added mod compliance_attest_ext;

Closes #879

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