Create(Note) flow

[sij411]

Description

Handle local note creation by producing Note + Create(Note) and emitting delivery actions.

Proposal

• On Input::UserCreateNote, create Note and wrap in Create activity
• Emit Action::StoreObject
• Emit Action::SendActivity(Create(Note), ...) for known followers

Done when

• Unit test: UserCreateNote in => StoreObject + SendActivity(Create(Note))
• No network/storage in core

Out of scope

• Mentions/hashtags/media
• Async delivery workers