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.

pkg/message/format.go

@@ -0,0 +1,28 @@
+package message
+
+import (
+	"bytes"
+	"text/template"
+)
+
+// Render executes a Go template string with the given data. Pure.
+func Render(tmpl string, data any) (string, error) {
+	t, err := template.New("").Parse(tmpl)
+	if err != nil {
+		return "", err
+	}
+	var buf bytes.Buffer
+	if err := t.Execute(&buf, data); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+// MustRender is like Render but panics on error. Use only in tests.
+func MustRender(tmpl string, data any) string {
+	s, err := Render(tmpl, data)
+	if err != nil {
+		panic(err)
+	}
+	return s
+}

pkg/message/parse.go

@@ -0,0 +1,51 @@
+// Package message provides pure parsing and formatting for Matrix messages.
+package message
+
+import (
+	"strings"
+
+	"github.com/enmanuel/agents/pkg/decision"
+)
+
+// ParseOptions configures how messages are parsed.
+type ParseOptions struct {
+	CommandPrefix    string   // e.g. "!"
+	BotUserID        string   // for mention detection, e.g. "@bot:server"
+	MentionedUserIDs []string // pre-extracted from m.mentions event field (modern Matrix spec)
+}
+
+// Parse converts a raw Matrix message body into a structured MessageContext. Pure.
+func Parse(body, senderID, roomID string, powerLevel int, isDM bool, opts ParseOptions) decision.MessageContext {
+	ctx := decision.MessageContext{
+		SenderID:    senderID,
+		RoomID:      roomID,
+		Content:     body,
+		PowerLevel:  powerLevel,
+		IsDirectMsg: isDM,
+	}
+
+	// Detect mention: check m.mentions list first (modern Matrix spec).
+	if opts.BotUserID != "" {
+		for _, uid := range opts.MentionedUserIDs {
+			if uid == opts.BotUserID {
+				ctx.IsMention = true
+				break
+			}
+		}
+		// Fallback: check if full user ID appears in the plain text body.
+		if !ctx.IsMention && strings.Contains(body, opts.BotUserID) {
+			ctx.IsMention = true
+		}
+	}
+
+	// Parse command
+	if opts.CommandPrefix != "" && strings.HasPrefix(body, opts.CommandPrefix) {
+		parts := strings.Fields(strings.TrimPrefix(body, opts.CommandPrefix))
+		if len(parts) > 0 {
+			ctx.Command = strings.ToLower(parts[0])
+			ctx.Args = parts[1:]
+		}
+	}
+
+	return ctx
+}