Integrate Bifrost LLM gateway, add test suite, implement memory pipeline

- Add Bifrost (maximhq/bifrost) as LLM gateway: all inference routes through
  bifrost:8080/v1 with retry logic and observability; VRAMManager keeps direct
  Ollama access for VRAM flush/prewarm operations
- Switch medium model from qwen3:4b to qwen2.5:1.5b (direct call, no tools)
  via _DirectModel wrapper; complex keeps create_deep_agent with qwen3:8b
- Implement out-of-agent memory pipeline: _retrieve_memories pre-fetches
  relevant context (injected into all tiers), _store_memory runs as background
  task after each reply writing to openmemory/Qdrant
- Add tests/unit/ with 133 tests covering router, channels, vram_manager,
  agent helpers; move integration test to tests/integration/
- Add bifrost-config.json with GPU Ollama (qwen2.5:0.5b/1.5b, qwen3:4b/8b,
  gemma3:4b) and CPU Ollama providers
- Integration test 28/29 pass (only grammy fails — no TELEGRAM_BOT_TOKEN)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/test_channels.py

@@ -0,0 +1,125 @@
+"""Unit tests for channels.py — register, deliver, pending_replies queue."""
+
+import asyncio
+import pytest
+from unittest.mock import AsyncMock, patch
+
+import channels
+
+
+@pytest.fixture(autouse=True)
+def reset_channels_state():
+    """Clear module-level state before and after every test."""
+    channels._callbacks.clear()
+    channels.pending_replies.clear()
+    yield
+    channels._callbacks.clear()
+    channels.pending_replies.clear()
+
+
+# ── register ───────────────────────────────────────────────────────────────────
+
+class TestRegister:
+    def test_register_stores_callback(self):
+        cb = AsyncMock()
+        channels.register("test_channel", cb)
+        assert channels._callbacks["test_channel"] is cb
+
+    def test_register_overwrites_existing(self):
+        cb1 = AsyncMock()
+        cb2 = AsyncMock()
+        channels.register("ch", cb1)
+        channels.register("ch", cb2)
+        assert channels._callbacks["ch"] is cb2
+
+    def test_register_multiple_channels(self):
+        cb_a = AsyncMock()
+        cb_b = AsyncMock()
+        channels.register("a", cb_a)
+        channels.register("b", cb_b)
+        assert channels._callbacks["a"] is cb_a
+        assert channels._callbacks["b"] is cb_b
+
+
+# ── deliver ────────────────────────────────────────────────────────────────────
+
+class TestDeliver:
+    async def test_deliver_enqueues_reply(self):
+        channels.register("cli", AsyncMock())
+        await channels.deliver("cli-alvis", "cli", "hello world")
+        q = channels.pending_replies["cli-alvis"]
+        assert not q.empty()
+        assert await q.get() == "hello world"
+
+    async def test_deliver_calls_channel_callback(self):
+        cb = AsyncMock()
+        channels.register("telegram", cb)
+        await channels.deliver("tg-123", "telegram", "reply text")
+        cb.assert_awaited_once_with("tg-123", "reply text")
+
+    async def test_deliver_unknown_channel_still_enqueues(self):
+        """No registered callback for channel → reply still goes to the queue."""
+        await channels.deliver("cli-bob", "nonexistent", "fallback reply")
+        q = channels.pending_replies["cli-bob"]
+        assert await q.get() == "fallback reply"
+
+    async def test_deliver_unknown_channel_does_not_raise(self):
+        """Missing callback must not raise an exception."""
+        await channels.deliver("cli-x", "ghost_channel", "msg")
+
+    async def test_deliver_creates_queue_if_absent(self):
+        channels.register("cli", AsyncMock())
+        assert "cli-new" not in channels.pending_replies
+        await channels.deliver("cli-new", "cli", "hi")
+        assert "cli-new" in channels.pending_replies
+
+    async def test_deliver_reuses_existing_queue(self):
+        """Second deliver to the same session appends to the same queue."""
+        channels.register("cli", AsyncMock())
+        await channels.deliver("cli-alvis", "cli", "first")
+        await channels.deliver("cli-alvis", "cli", "second")
+        q = channels.pending_replies["cli-alvis"]
+        assert await q.get() == "first"
+        assert await q.get() == "second"
+
+    async def test_deliver_telegram_sends_to_callback(self):
+        sent = []
+
+        async def fake_tg(session_id, text):
+            sent.append((session_id, text))
+
+        channels.register("telegram", fake_tg)
+        await channels.deliver("tg-999", "telegram", "test message")
+        assert sent == [("tg-999", "test message")]
+
+
+# ── register_defaults ──────────────────────────────────────────────────────────
+
+class TestRegisterDefaults:
+    def test_registers_telegram_and_cli(self):
+        channels.register_defaults()
+        assert "telegram" in channels._callbacks
+        assert "cli" in channels._callbacks
+
+    async def test_cli_callback_is_noop(self):
+        """CLI send callback does nothing (replies are handled via SSE queue)."""
+        channels.register_defaults()
+        cb = channels._callbacks["cli"]
+        # Should not raise and should return None
+        result = await cb("cli-alvis", "some reply")
+        assert result is None
+
+    async def test_telegram_callback_chunks_long_messages(self):
+        """Telegram callback splits messages > 4000 chars into chunks."""
+        channels.register_defaults()
+        cb = channels._callbacks["telegram"]
+        long_text = "x" * 9000  # > 4000 chars → should produce 3 chunks
+        with patch("channels.httpx.AsyncClient") as mock_client_cls:
+            mock_client = AsyncMock()
+            mock_client.__aenter__ = AsyncMock(return_value=mock_client)
+            mock_client.__aexit__ = AsyncMock(return_value=False)
+            mock_client.post = AsyncMock()
+            mock_client_cls.return_value = mock_client
+            await cb("tg-123", long_text)
+            # 9000 chars / 4000 per chunk = 3 POST calls
+            assert mock_client.post.await_count == 3