Fix AttributeError on bullet lines in extract_memory_from_chat (#873)

The fallback memory extractor (used by routes/memory_routes.py when the LLM
extractor fails) matched list items with `r'^[-*•]|\d+\.\s*(.*)'`. Operator
precedence makes that `(^[-*•]) | (\d+\.\s*(.*))`, so the capture group only
exists on the numbered-list branch.

A bullet line ("- foo") matches the first branch, so `group(1)` is None and
`text_match.group(1).strip()` raises AttributeError — crashing extraction for
any assistant message that contains a bullet list (i.e. most of them). Numbered
lists happened to work.

Group both markers — `r'^(?:[-*•]|\d+\.)\s*(.*)'` — so the capture applies to
bullets and numbers alike.

Adds tests/test_memory_bullet_extraction.py (red before, green after).

tests/test_memory_bullet_extraction.py

@@ -0,0 +1,26 @@
+"""Regression test: extract_memory_from_chat must not crash on bullet lines.
+
+The fallback memory extractor (invoked by routes/memory_routes.py when the LLM
+extractor fails) matched list items with ``r'^[-*•]|\\d+\\.\\s*(.*)'``. Because
+of alternation precedence that pattern is ``(^[-*•]) | (\\d+\\.\\s*(.*))`` — the
+capture group lives only in the numbered-list branch. A bullet line ("- ...")
+matches the first branch, so ``group(1)`` is ``None`` and ``.strip()`` raised
+``AttributeError``, crashing extraction for any assistant message that contains
+a bullet list (the dominant case).
+"""
+from src.memory import MemoryManager
+
+
+def test_extract_memory_from_chat_handles_bullets(tmp_path):
+    mgr = MemoryManager(str(tmp_path))
+    chat = [{
+        "role": "assistant",
+        "content": "- User likes coffee\n* Prefers tea in winter\n1. Wakes at 6am",
+    }]
+
+    out = mgr.extract_memory_from_chat(chat)
+    texts = [m["text"] for m in out]
+
+    assert "User likes coffee" in texts       # '-' bullet (used to crash)
+    assert "Prefers tea in winter" in texts   # '*' bullet (used to crash)
+    assert "Wakes at 6am" in texts            # numbered list (already worked)