Deletion verification report — confirm records are fully purged from all locations

[ringo380]

Summary

Generate a compliance-grade report confirming that specific records have been completely purged from all locations in a tablespace.

Implementation

Module: src/innodb/compliance.rs (extend)

Verification checklist:

1. Leaf pages: No delete-marked records matching criteria
2. Undo segments: No undo records referencing the target rows
3. Free space: No residual byte patterns in freed page regions
4. LOB chains: All LOB pages for target records freed
5. Secondary indexes: No entries pointing to target rows
6. Page history: Redo log shows no recent references (if available)

Report structure:

• Per-check pass/fail status
• Evidence details (page/offset for any failures)
• Overall compliance verdict: COMPLIANT / NON_COMPLIANT / INCONCLUSIVE
• Timestamp and scan parameters for audit trail

API:

pub struct DeletionVerification { verdict: Verdict, checks: Vec<VerificationCheck>, scan_time: Duration }
pub enum Verdict { Compliant, NonCompliant, Inconclusive }
pub fn verify_deletion(tablespace: &Tablespace, table: &str, criteria: &str) -> DeletionVerification;

Depends on

#175 (residue scanner), v5.0 #127/#128 (undo scanning), v5.0 #131/#132 (LOB chain)

Part of

Epic #165 (GDPR & Compliance Verification)