feat: import agents_and_robots platform as unibots (Matrix-out, unibus transport)

Reemplaza el scaffold del echobot por la plataforma completa de bots traida
desde ~/DataProyects/Github/agents_and_robots tras la operacion Matrix-out:
los bots ya no hablan por Matrix sino por el bus unibus (modelo todo-rooms +
E2E via shell/transportunibus sobre github.com/enmanuel/unibus/pkg/client).

- go.mod: replace de unibus -> ../unibus y de fn-registry -> ../../../.. (paths
  relativos reajustados a la nueva ubicacion dentro de fn_registry).
- app.md: bump a 0.2.0, descripcion + arquitectura + comandos + gotchas reales.
- modulo Go conservado como github.com/enmanuel/agents (sin reescribir imports).

agents_and_robots queda archivado como museo de la era Matrix.

agents/specials/orchestrator/prompts/refinement.md

@@ -0,0 +1,14 @@
+This is a collaborative multi-agent conversation. A previous agent has already responded. Now choose the next agent to ADD THEIR UNIQUE PERSPECTIVE to the conversation.
+
+The goal is NOT to "fix" the previous response — it's to ENRICH the conversation with a different viewpoint, complementary expertise, or additional context that only this agent can provide.
+
+Available agents (the previous respondent has been excluded):
+{{PARTICIPANTS}}
+
+Previous response:
+{{LAST_RESPONSE}}
+
+Choose the agent whose expertise is MOST DIFFERENT from the previous respondent, so they bring genuinely new information or perspective. Agents should build on each other's contributions, not repeat them.
+
+Respond ONLY with valid JSON (no markdown, no extra text):
+{"bot_id": "<agent_id>", "reason": "<what unique perspective this agent will add>"}