[F1] #3 — agentskit dev with hot-reload

[EmersonBraun]

User Story

As a dev, I want agentskit dev com hot-reload de prompts/tools/memory, to iterate fast without restarting.

Context

Issue derived from Master PRD #113 — story #3 of Phase 1.

Definition of Done

• Implementation
• Tests (unit + integration when applicable)
• Documentation updated
• Changeset created
• Review approved