Initial import of Shirobana bot backend

Include utility modules, shared channels, prompts, read-only skills, wardrobe memory and regression tests. Externalize legacy credentials and exclude private runtime state.

tests/test_stickers.py

@@ -0,0 +1,40 @@
+"""Runtime sticker disable switch tests; no real Telegram delivery."""
+
+from pathlib import Path
+import sys
+import tempfile
+import unittest
+from unittest.mock import AsyncMock, patch
+
+BASE = Path(__file__).resolve().parents[1]
+sys.path[:0] = [str(BASE / "bot-utility"), str(BASE)]
+
+from chat import engine
+
+
+class StickerSwitchTests(unittest.IsolatedAsyncioTestCase):
+    def test_disabled_hides_tags_from_model(self):
+        with patch.object(engine, "load_setting", return_value={"stickers": False}), \
+             patch.object(engine.os, "listdir") as listdir:
+            self.assertEqual(engine.available_sticker_tags(), [])
+        listdir.assert_not_called()
+
+    def test_enabled_still_loads_existing_tags(self):
+        with tempfile.TemporaryDirectory() as directory:
+            Path(directory, "happy.webp").write_bytes(b"sticker")
+            with patch.object(engine, "load_setting", return_value={"stickers": True}), \
+                 patch.object(engine, "STICKERS_DIR", directory):
+                self.assertEqual(engine.available_sticker_tags(), ["happy"])
+
+    async def test_disabled_blocks_direct_send_even_with_tag(self):
+        bot = type("Bot", (), {"send_sticker": AsyncMock()})()
+        channel = type("Channel", (), {"bot": bot})()
+        with patch.object(engine, "load_setting", return_value={"stickers": False}), \
+             patch.object(engine, "_resolve_delivery") as resolve:
+            await engine._maybe_send_sticker(channel, 1, "happy")
+        resolve.assert_not_called()
+        bot.send_sticker.assert_not_awaited()
+
+
+if __name__ == "__main__":
+    unittest.main()