fix: raise ramdisk file table to 2048 entries, log when full

The 0:/usr devkit pushed the base image to ~650 files, past the
ramdisk's MaxFiles = 512. The USTAR loader silently dropped the tail
of the archive and, worse, every runtime Create/Mkdir failed once the
table was full - so first-boot account creation could not write the
user database and every login failed with "invalid username or
password".

Raise MaxFiles to 2048 (256 KiB static table) and log loudly both
when archive entries are dropped at load and when Create/Mkdir hit
the cap, so a full table can never masquerade as an auth failure
again.

Verified in QEMU end to end: setup -> create account -> log in ->
desktop.

Co-Authored-By: Claude Fable 5 <[email protected]>

kernel/src/Api/BuildNo.hpp

@@ -12,4 +12,4 @@
 
 #pragma once
 
-#define MONTAUK_BUILD_NUMBER 11
+#define MONTAUK_BUILD_NUMBER 12

kernel/src/Fs/Ramdisk.cpp

@@ -161,6 +161,12 @@ namespace Fs::Ramdisk {
             ptr += 512 + dataBlocks * 512;
         }
 
+        if (fileCount >= MaxFiles && ptr + 512 <= end) {
+            Kt::KernelLogStream(Kt::ERROR, "Ramdisk")
+                << "File table full (MaxFiles=" << MaxFiles
+                << "), remaining archive entries were DROPPED";
+        }
+
         Kt::KernelLogStream(Kt::OK, "Ramdisk") << "Loaded " << fileCount << " entries";
     }
 
@@ -340,7 +346,11 @@ namespace Fs::Ramdisk {
 
     int Create(const char* path) {
         if (path == nullptr) return -1;
-        if (fileCount >= MaxFiles) return -1;
+        if (fileCount >= MaxFiles) {
+            Kt::KernelLogStream(Kt::ERROR, "Ramdisk")
+                << "Create failed: file table full (MaxFiles=" << MaxFiles << ")";
+            return -1;
+        }
 
         // Normalize: skip leading '/'
         if (path[0] == '/') path++;
@@ -425,7 +435,11 @@ namespace Fs::Ramdisk {
 
     int Mkdir(const char* path) {
         if (path == nullptr) return -1;
-        if (fileCount >= MaxFiles) return -1;
+        if (fileCount >= MaxFiles) {
+            Kt::KernelLogStream(Kt::ERROR, "Ramdisk")
+                << "Mkdir failed: file table full (MaxFiles=" << MaxFiles << ")";
+            return -1;
+        }
         if (path[0] == '/') path++;
 
         // Check if directory already exists

kernel/src/Fs/Ramdisk.hpp

@@ -10,7 +10,9 @@
 
 namespace Fs::Ramdisk {
 
-    static constexpr int MaxFiles = 512;
+    // Static file table. The base image ships ~650 files since the
+    // 0:/usr devkit; keep generous headroom for runtime file creation.
+    static constexpr int MaxFiles = 2048;
     static constexpr int MaxNameLen = 100;
 
     struct FileEntry {