- Handle-enriched audit log (user_handle, actor_handle via aliased double-JOIN)
- user_handle filter with handle-to-UUID resolution, empty result for unknown handles
- fetch+Blob CSV export replacing window.location.href (T-06.2-04-03)
- GET /audit-log/daily-exports and /daily-exports/{date} with date regex validation
- Daily exports section in AuditLogTab with date dropdown + Download button
- Full audit test suite: 10 passed; backend suite: 337 passed, 1 pre-existing failure
curo1305
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