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/test/units/constants.ink

@@ -0,0 +1,26 @@
+CONST STRING_EXAMPLE = "This is the string constant"
+CONST BOOLEAN_EXAMLPE_TRUE = true
+CONST BOOLEAN_EXAMLPE_FALSE = false
+
+CONST LOBBY = 1
+CONST STAIRCASE = 2
+CONST HALLWAY = 3
+CONST HELD_BY_AGENT = -1
+
+VAR secret_agent_location = LOBBY
+VAR suitcase_location = HALLWAY
+
+{ STRING_EXAMPLE }. One is { BOOLEAN_EXAMLPE_TRUE }. Zero is { BOOLEAN_EXAMLPE_FALSE }.
+
+-> report_progress
+
+=== report_progress ===
+{  secret_agent_location == suitcase_location:
+	The secret agent grabs the suitcase!
+	~ suitcase_location = HELD_BY_AGENT
+
+-  secret_agent_location < suitcase_location:
+	The secret agent moves forward.
+	~ secret_agent_location++
+	-> report_progress
+}