WIP: Save agent roles integration work before CHORUS rebrand

- Agent roles and coordination features
- Chat API integration testing
- New configuration and workspace management

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

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

vendor/github.com/quic-go/webtransport-go/errors.go

@@ -0,0 +1,78 @@
+package webtransport
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/quic-go/quic-go"
+)
+
+// StreamErrorCode is an error code used for stream termination.
+type StreamErrorCode uint32
+
+// SessionErrorCode is an error code for session termination.
+type SessionErrorCode uint32
+
+const (
+	firstErrorCode = 0x52e4a40fa8db
+	lastErrorCode  = 0x52e5ac983162
+)
+
+func webtransportCodeToHTTPCode(n StreamErrorCode) quic.StreamErrorCode {
+	return quic.StreamErrorCode(firstErrorCode) + quic.StreamErrorCode(n) + quic.StreamErrorCode(n/0x1e)
+}
+
+func httpCodeToWebtransportCode(h quic.StreamErrorCode) (StreamErrorCode, error) {
+	if h < firstErrorCode || h > lastErrorCode {
+		return 0, errors.New("error code outside of expected range")
+	}
+	if (h-0x21)%0x1f == 0 {
+		return 0, errors.New("invalid error code")
+	}
+	shifted := h - firstErrorCode
+	return StreamErrorCode(shifted - shifted/0x1f), nil
+}
+
+func isWebTransportError(e error) bool {
+	if e == nil {
+		return false
+	}
+	var strErr *quic.StreamError
+	if !errors.As(e, &strErr) {
+		return false
+	}
+	if strErr.ErrorCode == sessionCloseErrorCode {
+		return true
+	}
+	_, err := httpCodeToWebtransportCode(strErr.ErrorCode)
+	return err == nil
+}
+
+// WebTransportBufferedStreamRejectedErrorCode is the error code of the
+// H3_WEBTRANSPORT_BUFFERED_STREAM_REJECTED error.
+const WebTransportBufferedStreamRejectedErrorCode quic.StreamErrorCode = 0x3994bd84
+
+// StreamError is the error that is returned from stream operations (Read, Write) when the stream is canceled.
+type StreamError struct {
+	ErrorCode StreamErrorCode
+}
+
+func (e *StreamError) Is(target error) bool {
+	_, ok := target.(*StreamError)
+	return ok
+}
+
+func (e *StreamError) Error() string {
+	return fmt.Sprintf("stream canceled with error code %d", e.ErrorCode)
+}
+
+// ConnectionError is a WebTransport connection error.
+type ConnectionError struct {
+	Remote    bool
+	ErrorCode SessionErrorCode
+	Message   string
+}
+
+var _ error = &ConnectionError{}
+
+func (e *ConnectionError) Error() string { return e.Message }