Add memo.addSection and memo.deleteSection RPC methods with full-stack
implementation: contract types, Zod schemas, DB queries, RPC handlers,
UI buttons, and tests.
- memo.addSection: creates a new empty section, supports positional
insert after a given section via afterSectionId
- memo.deleteSection: removes a section and cascades cleanup of its
annotations, citations, and section reviews
- Outline sidebar: per-section delete button, + Add Section button
- Article area: + Add Section button after last section
- 9 new tests (15 total memo tests, 48 project-wide)
francy51
0e5a31866f