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.

shell/logger/cleanup_test.go

@@ -0,0 +1,110 @@
+package logger
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestCleanOldLogs(t *testing.T) {
+	dir := t.TempDir()
+	agentDir := filepath.Join(dir, "bot1")
+	os.MkdirAll(agentDir, 0o755)
+
+	// Create files: 10 days ago, 5 days ago, today.
+	files := []string{
+		"2026-02-24.jsonl",
+		"2026-02-24.jsonl.gz",
+		"2026-03-01.jsonl",
+		"2026-03-06.jsonl",
+	}
+	for _, f := range files {
+		os.WriteFile(filepath.Join(agentDir, f), []byte("{}"), 0o644)
+	}
+
+	// Retain 7 days → should remove 2026-02-24 files.
+	cleanOldLogs(dir, "bot1", 7)
+
+	remaining, _ := os.ReadDir(agentDir)
+	names := make(map[string]bool)
+	for _, e := range remaining {
+		names[e.Name()] = true
+	}
+
+	if names["2026-02-24.jsonl"] {
+		t.Error("2026-02-24.jsonl should have been removed")
+	}
+	if names["2026-02-24.jsonl.gz"] {
+		t.Error("2026-02-24.jsonl.gz should have been removed")
+	}
+	if !names["2026-03-01.jsonl"] {
+		t.Error("2026-03-01.jsonl should still exist")
+	}
+	if !names["2026-03-06.jsonl"] {
+		t.Error("2026-03-06.jsonl should still exist")
+	}
+}
+
+func TestParseDateFromFilename(t *testing.T) {
+	tests := []struct {
+		name string
+		want string
+	}{
+		{"2026-03-06.jsonl", "2026-03-06"},
+		{"2026-03-06.1.jsonl", "2026-03-06"},
+		{"2026-03-06.jsonl.gz", "2026-03-06"},
+		{"2026-03-06.2.jsonl.gz", "2026-03-06"},
+		{"invalid.jsonl", ""},
+	}
+	for _, tt := range tests {
+		d := parseDateFromFilename(tt.name)
+		got := ""
+		if !d.IsZero() {
+			got = d.Format("2006-01-02")
+		}
+		if got != tt.want {
+			t.Errorf("parseDateFromFilename(%q) = %q, want %q", tt.name, got, tt.want)
+		}
+	}
+}
+
+func TestCleanOldLogs_EmptyDir(t *testing.T) {
+	dir := t.TempDir()
+	// Should not panic on non-existent agent dir.
+	cleanOldLogs(dir, "nonexistent", 7)
+}
+
+func TestIsLogFile(t *testing.T) {
+	if !isLogFile("2026-03-06.jsonl") {
+		t.Error("should match .jsonl")
+	}
+	if !isLogFile("2026-03-06.jsonl.gz") {
+		t.Error("should match .jsonl.gz")
+	}
+	if isLogFile("readme.txt") {
+		t.Error("should not match .txt")
+	}
+}
+
+func TestRunCleanup_Cancellation(t *testing.T) {
+	dir := t.TempDir()
+	os.MkdirAll(filepath.Join(dir, "bot1"), 0o755)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	done := make(chan struct{})
+	go func() {
+		runCleanup(ctx, dir, "bot1", 7, 50*time.Millisecond)
+		close(done)
+	}()
+
+	time.Sleep(150 * time.Millisecond)
+	cancel()
+
+	select {
+	case <-done:
+	case <-time.After(2 * time.Second):
+		t.Error("cleanup goroutine did not exit after cancel")
+	}
+}