[v3.2] Machine unlearning at scale

[LEEI1337]

Description

Implement GDPR Art. 17 compliant machine unlearning for the Knowledge Fabric.

Tasks

• Research unlearning approaches for vector stores
• Implement selective vector deletion with verification
• Add unlearning audit trail
• Implement verification that data is truly removed
• Write compliance tests
• Document unlearning process and limitations

Milestone

This is a v3.2 roadmap feature for GDPR right-to-erasure compliance.