feat: real stat metadata across all filesystems, plus mkdir and rmdir

kernel/src/Fs/Boot.cpp

@@ -69,6 +69,23 @@ namespace Fs {
         const char* RdGetLabel(void*) { return Ramdisk::GetLabel(); }
         int RdReadDirAt(void*, const char* p, const char** o, int m, int s) { return Ramdisk::ReadDirAt(p, o, m, s); }
 
+        int RdStat(void*, const char* p, Vfs::StatInfo* out) {
+            if (out == nullptr) return -1;
+
+            Ramdisk::StatResult st;
+            if (Ramdisk::Stat(p, &st) != 0) return -1;
+
+            out->size  = st.size;
+            // The USTAR header carries a single timestamp; report it for all
+            // three rather than leaving ctime/atime at the epoch.
+            out->mtime = st.mtime;
+            out->ctime = st.mtime;
+            out->atime = st.mtime;
+            out->mode  = (st.isDirectory ? Vfs::ModeDir : Vfs::ModeReg) | (st.mode & 07777);
+            out->isDir = st.isDirectory;
+            return 0;
+        }
+
         Vfs::FsDriver g_ramdiskDriver = {
             .ctx       = nullptr,
             .Open      = RdOpen,
@@ -83,7 +100,7 @@ namespace Fs {
             .Rename    = RdRename,
             .GetLabel  = RdGetLabel,
             .ReadDirAt = RdReadDirAt,
-            .Stat      = nullptr,
+            .Stat      = RdStat,
             // Statically allocated: nothing to release.
             .Unmount   = nullptr,
         };