Integrate BACKBEAT SDK and resolve KACHING license validation

Major integrations and fixes:
- Added BACKBEAT SDK integration for P2P operation timing
- Implemented beat-aware status tracking for distributed operations
- Added Docker secrets support for secure license management
- Resolved KACHING license validation via HTTPS/TLS
- Updated docker-compose configuration for clean stack deployment
- Disabled rollback policies to prevent deployment failures
- Added license credential storage (CHORUS-DEV-MULTI-001)

Technical improvements:
- BACKBEAT P2P operation tracking with phase management
- Enhanced configuration system with file-based secrets
- Improved error handling for license validation
- Clean separation of KACHING and CHORUS deployment stacks

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

vendor/github.com/libp2p/go-buffer-pool/writer.go

@@ -0,0 +1,119 @@
+package pool
+
+import (
+	"bufio"
+	"io"
+	"sync"
+)
+
+const WriterBufferSize = 4096
+
+var bufioWriterPool = sync.Pool{
+	New: func() interface{} {
+		return bufio.NewWriterSize(nil, WriterBufferSize)
+	},
+}
+
+// Writer is a buffered writer that returns its internal buffer in a pool when
+// not in use.
+type Writer struct {
+	W    io.Writer
+	bufw *bufio.Writer
+}
+
+func (w *Writer) ensureBuffer() {
+	if w.bufw == nil {
+		w.bufw = bufioWriterPool.Get().(*bufio.Writer)
+		w.bufw.Reset(w.W)
+	}
+}
+
+// Write writes the given byte slice to the underlying connection.
+//
+// Note: Write won't return the write buffer to the pool even if it ends up
+// being empty after the write. You must call Flush() to do that.
+func (w *Writer) Write(b []byte) (int, error) {
+	if w.bufw == nil {
+		if len(b) >= WriterBufferSize {
+			return w.W.Write(b)
+		}
+		w.bufw = bufioWriterPool.Get().(*bufio.Writer)
+		w.bufw.Reset(w.W)
+	}
+	return w.bufw.Write(b)
+}
+
+// Size returns the size of the underlying buffer.
+func (w *Writer) Size() int {
+	return WriterBufferSize
+}
+
+// Available returns the amount buffer space available.
+func (w *Writer) Available() int {
+	if w.bufw != nil {
+		return w.bufw.Available()
+	}
+	return WriterBufferSize
+}
+
+// Buffered returns the amount of data buffered.
+func (w *Writer) Buffered() int {
+	if w.bufw != nil {
+		return w.bufw.Buffered()
+	}
+	return 0
+}
+
+// WriteByte writes a single byte.
+func (w *Writer) WriteByte(b byte) error {
+	w.ensureBuffer()
+	return w.bufw.WriteByte(b)
+}
+
+// WriteRune writes a single rune, returning the number of bytes written.
+func (w *Writer) WriteRune(r rune) (int, error) {
+	w.ensureBuffer()
+	return w.bufw.WriteRune(r)
+}
+
+// WriteString writes a string, returning the number of bytes written.
+func (w *Writer) WriteString(s string) (int, error) {
+	w.ensureBuffer()
+	return w.bufw.WriteString(s)
+}
+
+// Flush flushes the write buffer, if any, and returns it to the pool.
+func (w *Writer) Flush() error {
+	if w.bufw == nil {
+		return nil
+	}
+	if err := w.bufw.Flush(); err != nil {
+		return err
+	}
+	w.bufw.Reset(nil)
+	bufioWriterPool.Put(w.bufw)
+	w.bufw = nil
+	return nil
+}
+
+// Close flushes the underlying writer and closes it if it implements the
+// io.Closer interface.
+//
+// Note: Close() closes the writer even if Flush() fails to avoid leaking system
+// resources. If you want to make sure Flush() succeeds, call it first.
+func (w *Writer) Close() error {
+	var (
+		ferr, cerr error
+	)
+	ferr = w.Flush()
+
+	// always close even if flush fails.
+	if closer, ok := w.W.(io.Closer); ok {
+		cerr = closer.Close()
+	}
+
+	if ferr != nil {
+		return ferr
+	}
+	return cerr
+}