Vendor libs/hump, sfxrlua, json4lua, narrator as real files

These were committed as empty submodule gitlinks with no .gitmodules,
so the folders were never populated and the game could not load
(require of libs/hump/timer, libs/sfxrlua/sfxr, narrator.narrator).
Checked out each at its pinned commit and vendored the files, matching
the existing bundled-libs convention. Removed the junk libs/libs/ tree.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

libs/narrator/.vscode/tasks.json

@@ -0,0 +1,18 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Busted",
+            "command": "busted",
+            "args": [
+                "${workspaceFolder}/test/run.lua"
+            ],
+            "type": "shell",
+            "problemMatcher": [],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        }
+    ]
+}