Implement AttachmentFields to track molecule attachments on pinned/handoff beads:
- AttachedMolecule: root issue ID of attached molecule
- AttachedAt: timestamp when attached
API:
- AttachMolecule(pinnedBeadID, moleculeID) - attach
- DetachMolecule(pinnedBeadID) - detach
- GetAttachment(pinnedBeadID) - query
- ParseAttachmentFields(issue) - parse from description
- FormatAttachmentFields(fields) - format for description
Includes comprehensive tests for parsing and API.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>