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_no_paraphrase_opener.py

@@ -0,0 +1,26 @@
+"""Avoid formulaic user-intent paraphrase openings without removing address preferences."""
+from pathlib import Path
+import sys
+import unittest
+BASE = Path(__file__).resolve().parents[1]
+sys.path[:0] = [str(BASE / 'bot-utility'), str(BASE)]
+from chat import engine
+
+
+class NoParaphraseOpenerTests(unittest.TestCase):
+    def test_global_style_covers_template_and_same_family(self):
+        text = engine.load_instruction('style_instructions.txt')
+        for phrase in ('主人这是在……呀', '原来主人是在', '看来主人是想',
+                       '主人这是……呢', '你这是/看来你是/所以你是',
+                       '无需每次先概括、解释或揣测', '不把猜测说成事实',
+                       '“主人”这个称呼保留并自然使用'):
+            self.assertIn(phrase, text)
+
+    def test_live_and_builtin_defaults_match(self):
+        text = engine.load_instruction('style_instructions.txt')
+        self.assertEqual(text.strip(), engine.DEFAULT_STYLE_INSTRUCTIONS.strip())
+        self.assertIn('主人这是在……呀', engine.BASE_PROMPT)
+
+
+if __name__ == '__main__':
+    unittest.main()