fix(mount): include types.go (BulkWriteFile aliases + BulkWriteResponse)

CI failed on the PR because syncer.go references BulkWriteFile,
BulkWriteResponse, BulkWriteError, and ErrEmptyBulkWrite — all defined
in this file, but the file was created during the workflow run and
never committed. The workflow's commit step listed files explicitly and
missed this one.

Confirmed `go test ./internal/mountsync/...` passes locally once this
file is present.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: khaliqgant

internal/mountsync/types.go

@@ -0,0 +1,48 @@
+package mountsync
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/agentworkforce/relayfile/internal/relayfile"
+)
+
+type BulkWriteFile = relayfile.BulkWriteFile
+
+type BulkWriteError = relayfile.BulkWriteError
+
+type BulkWriteResult struct {
+	Path        string `json:"path"`
+	Revision    string `json:"revision"`
+	ContentType string `json:"contentType,omitempty"`
+}
+
+type BulkWriteResponse struct {
+	Written       int               `json:"written"`
+	ErrorCount    int               `json:"errorCount"`
+	Errors        []BulkWriteError  `json:"errors"`
+	Results       []BulkWriteResult `json:"results,omitempty"`
+	Files         []RemoteFile      `json:"files,omitempty"`
+	CorrelationID string            `json:"correlationId"`
+}
+
+var ErrEmptyBulkWrite = errors.New("bulk write requires at least one file")
+
+func (r BulkWriteResponse) revisionsByPath() map[string]string {
+	byPath := make(map[string]string, len(r.Results)+len(r.Files))
+	for _, result := range r.Results {
+		revision := strings.TrimSpace(result.Revision)
+		if revision == "" {
+			continue
+		}
+		byPath[normalizeRemotePath(result.Path)] = revision
+	}
+	for _, file := range r.Files {
+		revision := strings.TrimSpace(file.Revision)
+		if revision == "" {
+			continue
+		}
+		byPath[normalizeRemotePath(file.Path)] = revision
+	}
+	return byPath
+}