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/writer.go

@@ -0,0 +1,168 @@
+package logger
+
+import (
+	"compress/gzip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+// DailyRotatingWriter is an io.Writer that rotates log files daily and by
+// size. Files are named <baseDir>/<agentID>/YYYY-MM-DD.jsonl with optional
+// numeric suffixes for size-based splits within the same day.
+type DailyRotatingWriter struct {
+	baseDir   string
+	agentID   string
+	maxSize   int64 // bytes
+	compress  bool
+	nowFunc   func() time.Time // for testing; defaults to time.Now().UTC
+	dir       string           // resolved agent log directory
+
+	mu         sync.Mutex
+	current    *os.File
+	written    int64
+	currentDay string
+	suffix     int
+}
+
+// NewDailyRotatingWriter creates a writer that stores logs under
+// baseDir/agentID/. It creates the directory if needed and opens the first
+// log file for today.
+func NewDailyRotatingWriter(baseDir, agentID string, maxSizeMB int64, compress bool) (*DailyRotatingWriter, error) {
+	dir := filepath.Join(baseDir, agentID)
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return nil, fmt.Errorf("create log dir %s: %w", dir, err)
+	}
+
+	w := &DailyRotatingWriter{
+		baseDir:  baseDir,
+		agentID:  agentID,
+		maxSize:  maxSizeMB * 1024 * 1024,
+		compress: compress,
+		nowFunc:  func() time.Time { return time.Now().UTC() },
+		dir:      dir,
+	}
+
+	if err := w.openFile(); err != nil {
+		return nil, err
+	}
+	return w, nil
+}
+
+// Write implements io.Writer with daily and size-based rotation.
+func (w *DailyRotatingWriter) Write(p []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	today := w.nowFunc().Format("2006-01-02")
+
+	// Day changed → rotate to new day file.
+	if today != w.currentDay {
+		if err := w.rotate(today, 0); err != nil {
+			return 0, err
+		}
+	}
+
+	// Size exceeded → split within same day.
+	if w.written+int64(len(p)) > w.maxSize && w.written > 0 {
+		w.suffix++
+		if err := w.rotate(today, w.suffix); err != nil {
+			return 0, err
+		}
+	}
+
+	n, err := w.current.Write(p)
+	w.written += int64(n)
+	return n, err
+}
+
+// Close closes the current log file.
+func (w *DailyRotatingWriter) Close() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.current != nil {
+		return w.current.Close()
+	}
+	return nil
+}
+
+// rotate closes the current file (optionally compressing it) and opens a new one.
+func (w *DailyRotatingWriter) rotate(day string, suffix int) error {
+	prev := w.current
+	prevPath := ""
+	if prev != nil {
+		prevPath = prev.Name()
+		prev.Close()
+	}
+
+	// Compress the previous file in the background if enabled and it's from a
+	// different day (we don't compress intra-day splits until day rotates).
+	if w.compress && prevPath != "" && day != w.currentDay {
+		go compressFile(prevPath)
+	}
+
+	w.currentDay = day
+	w.suffix = suffix
+	w.written = 0
+
+	return w.openFile()
+}
+
+// openFile opens (or creates) the log file for the current day/suffix.
+func (w *DailyRotatingWriter) openFile() error {
+	w.currentDay = w.nowFunc().Format("2006-01-02")
+	name := w.filename(w.currentDay, w.suffix)
+
+	f, err := os.OpenFile(name, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644)
+	if err != nil {
+		return fmt.Errorf("open log file %s: %w", name, err)
+	}
+
+	// Track how much has already been written (append mode).
+	info, err := f.Stat()
+	if err != nil {
+		f.Close()
+		return err
+	}
+
+	w.current = f
+	w.written = info.Size()
+	return nil
+}
+
+// filename returns the full path for a given day and suffix.
+func (w *DailyRotatingWriter) filename(day string, suffix int) string {
+	if suffix == 0 {
+		return filepath.Join(w.dir, day+".jsonl")
+	}
+	return filepath.Join(w.dir, fmt.Sprintf("%s.%d.jsonl", day, suffix))
+}
+
+// compressFile gzips src to src.gz and removes the original.
+func compressFile(src string) {
+	in, err := os.Open(src)
+	if err != nil {
+		return
+	}
+	defer in.Close()
+
+	out, err := os.Create(src + ".gz")
+	if err != nil {
+		return
+	}
+
+	gz := gzip.NewWriter(out)
+	if _, err := io.Copy(gz, in); err != nil {
+		gz.Close()
+		out.Close()
+		os.Remove(src + ".gz")
+		return
+	}
+	gz.Close()
+	out.Close()
+	in.Close()
+	os.Remove(src)
+}