feat: use git remote URL for cross-machine project memory sync

src/services/tags.ts

@@ -15,6 +15,43 @@ export function getGitEmail(): string | null {
   }
 }
 
+/**
+ * Normalize a git remote URL to a canonical form so that SSH, HTTPS,
+ * and with/without `.git` suffix all produce the same identifier.
+ *
+ * Examples:
+ *   git@github.com:user/repo.git   → github.com/user/repo
+ *   https://github.com/user/repo   → github.com/user/repo
+ *   git@gitlab.com:org/sub/repo.git → gitlab.com/org/sub/repo
+ */
+export function normalizeGitUrl(url: string): string {
+  return url
+    .replace(/^[a-z+]+:\/\//, "")   // strip protocol (https://, git://, ssh://)
+    .replace(/^[^@]+@/, "")          // strip user@ prefix (git@, user@)
+    .replace(/:(\d+)\//, "/$1/")     // preserve port numbers (e.g. :8080/)
+    .replace(":", "/")               // SSH colon to slash (github.com:user → github.com/user)
+    .replace(/\.git$/, "")           // strip trailing .git
+    .replace(/\/+$/, "");            // strip trailing slashes
+}
+
+/**
+ * Get the git remote URL for the given directory.
+ * This provides a stable, cross-machine identifier for projects.
+ * Returns null if not in a git repo or no remote configured.
+ */
+export function getGitRemoteUrl(directory: string): string | null {
+  try {
+    const remoteUrl = execSync("git config --get remote.origin.url", {
+      cwd: directory,
+      encoding: "utf-8",
+      stdio: ["pipe", "pipe", "pipe"],
+    }).trim();
+    return remoteUrl || null;
+  } catch {
+    return null;
+  }
+}
+
 export function getUserTag(): string {
   // If userContainerTag is explicitly set, use it
   if (CONFIG.userContainerTag) {
@@ -36,7 +73,14 @@ export function getProjectTag(directory: string): string {
     return CONFIG.projectContainerTag;
   }
 
-  // Otherwise, auto-generate based on containerTagPrefix
+  // Try to use git remote URL as a stable cross-machine project identifier
+  // This allows the same project on different machines to share memories
+  const remoteUrl = getGitRemoteUrl(directory);
+  if (remoteUrl) {
+    return `${CONFIG.containerTagPrefix}_project_${sha256(normalizeGitUrl(remoteUrl))}`;
+  }
+
+  // Fall back to directory path hash (machine-specific)
   return `${CONFIG.containerTagPrefix}_project_${sha256(directory)}`;
 }