Implement: P2 Motion And Voting Other T3

[rubenvdlinde]

Change folder

openspec/changes/p2-motion-and-voting-other-t3/

Hydra build expectations

Manifest-first per ADR-022/024/031:

• Schema declarations in lib/Settings/decidesk_register.json (or equivalent)
• src/manifest.json updates for any new pages/widgets
• Tests for any net-new behaviour
• Minimal-to-zero new PHP service classes (domain logic in x-openregister-lifecycle rules)
• Consume from OpenRegister (RBAC, workflow, audit, approval) — do not reimplement

Read before building

• openspec/changes/p2-motion-and-voting-other-t3/proposal.md — motivation + scope
• openspec/changes/p2-motion-and-voting-other-t3/design.md — decisions + reuse analysis
• openspec/changes/p2-motion-and-voting-other-t3/tasks.md — concrete tasks
• openspec/changes/p2-motion-and-voting-other-t3/specs/<capability>/spec.md — REQ list + scenarios