fix(skills): preserve escaped quotes in frontmatter lists (#6265)

* fix(skills): preserve escaped quotes in frontmatter lists

* test(skills): use descriptive frontmatter examples

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Co-authored-by: Bolt4243 <277300782+Bolt4243@users.noreply.github.com>

services/memory/skill_format.py

@@ -130,10 +130,15 @@ def _parse_scalar(raw: str, *, string_only: bool = False) -> Any:
 def _split_top_level(s: str, sep: str) -> List[str]:
     """Split `s` on `sep` ignoring separators inside [] or quotes."""
     out, buf, depth, quote = [], [], 0, None
+    escaped = False
     for ch in s:
         if quote:
             buf.append(ch)
-            if ch == quote:
+            if escaped:
+                escaped = False
+            elif ch == "\\" and quote == '"':
+                escaped = True
+            elif ch == quote:
                 quote = None
             continue
         if ch in ("'", '"'):