bar: $nalej invents cocktails, $menu keeps the bar's growing lore

The most in-character capability the bot has: the persona is literally a 200kg
bartender who mixes strong drinks with intriguing names. New always-loaded cog
bar_commands:

* $nalej [motyw] asks the ACTIVE AI backend (whatever $gadaj_teraz selects) to
  invent one themed cocktail in Conjurer's voice - persona reused from
  GPT_SETTINGS[0] as a system message, instructions as the user turn, via
  handle_response request_type NONE so it never pollutes the bar's conversation
  memory. Empty motyw = a surprise; "radio"/"pod muzykę" themes the drink on the
  track currently playing (PREPPED_TRACKS["now_playing"]).
* every drink is appended to menu.json (new seeded state file, CONJURER_MENU_FILE
  overridable) with name/theme/author/timestamp/full text - emergent bar lore.
* $menu lists the invented drinks and pours one at random from the archive.

Text-only for now; a DALL-E drink image is an easy follow-up (the render path
already exists in ai_commands, OpenAI-only).

constants gains MENU_FILE (next to pamiec.json by default) + its seed; bot.py
registers bar_commands as a core cog. Verified: tests/unit/test_bar_commands.py
covers name extraction (markers/markdown/fallback) and the menu round-trip
incl. corrupt-file tolerance; unit job 32 passed.

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

tests/unit/test_bar_commands.py

@@ -0,0 +1,98 @@
+"""Unit tests for bar_commands: drink-name parsing and menu persistence.
+
+The unit CI job installs only pytest, so bar_commands' heavy imports (discord,
+ai_functions -> openai/tiktoken, communication_subroutine -> flask) are stubbed
+only when genuinely absent - locally the real packages are used.
+"""
+import sys
+import types
+
+
+def _stub_if_missing(name, build):
+    if name in sys.modules:
+        return
+    try:
+        __import__(name)
+    except ImportError:
+        sys.modules[name] = build()
+
+
+def _build_discord():
+    mod = types.ModuleType("discord")
+
+    class Object:
+        def __init__(self, id=None):  # noqa: A002 - mirrors discord.Object
+            self.id = id
+
+    mod.Object = Object
+    ext = types.ModuleType("discord.ext")
+    commands = types.ModuleType("discord.ext.commands")
+
+    class Cog:
+        pass
+
+    def hybrid_command(**_kwargs):
+        return lambda fn: fn
+
+    commands.Cog = Cog
+    commands.hybrid_command = hybrid_command
+    ext.commands = commands
+    mod.ext = ext
+    sys.modules["discord.ext"] = ext
+    sys.modules["discord.ext.commands"] = commands
+    return mod
+
+
+def _build_ai_functions():
+    mod = types.ModuleType("ai_functions")
+
+    async def handle_response(*_a, **_k):
+        return ("stub", [])
+
+    mod.handle_response = handle_response
+    return mod
+
+
+def _build_comm():
+    mod = types.ModuleType("communication_subroutine")
+    mod.PREPPED_TRACKS = {"now_playing": ""}
+    return mod
+
+
+_stub_if_missing("discord", _build_discord)
+_stub_if_missing("ai_functions", _build_ai_functions)
+_stub_if_missing("communication_subroutine", _build_comm)
+
+import bar_commands  # noqa: E402  (after stubbing)
+
+
+def test_extract_name_strips_markers_and_markdown():
+    assert bar_commands._extract_name("🍸 Krew Wilka\nskładniki...") == "Krew Wilka"
+    assert bar_commands._extract_name("**Miód Odyna**\nfoo") == "Miód Odyna"
+    assert bar_commands._extract_name("1. Cichy Grom\nbar") == "Cichy Grom"
+    assert bar_commands._extract_name("\n\n   Ostatni Skald  \nx") == "Ostatni Skald"
+
+
+def test_extract_name_fallback_on_empty():
+    assert bar_commands._extract_name("") == "Bezimienny drink"
+    assert bar_commands._extract_name("\n   \n") == "Bezimienny drink"
+
+
+def test_menu_round_trip(tmp_path, monkeypatch):
+    menu_file = tmp_path / "menu.json"
+    monkeypatch.setattr(bar_commands, "MENU_FILE", str(menu_file))
+
+    assert bar_commands._load_menu() == []  # missing file -> empty
+
+    bar_commands._append_menu({"nazwa": "Krew Wilka", "autor": "Hammer"})
+    bar_commands._append_menu({"nazwa": "Miód Odyna", "autor": "Siara"})
+
+    menu = bar_commands._load_menu()
+    assert [d["nazwa"] for d in menu] == ["Krew Wilka", "Miód Odyna"]
+
+
+def test_load_menu_survives_corrupt_file(tmp_path, monkeypatch):
+    menu_file = tmp_path / "menu.json"
+    menu_file.write_text("{ not json", encoding="utf-8")
+    monkeypatch.setattr(bar_commands, "MENU_FILE", str(menu_file))
+    assert bar_commands._load_menu() == []