fix(mcp): corpus_status sorts Published dates chronologically

corpus_status compared HPE "Published" values ("July 2026") as plain
strings, so "March 2026" outranked "July 2026" for the most-recent date
and the most-recently-edited ordering. Parse to (year, month) for both.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01SXZ3ZdHEP75P9YmyFM7W3k

docs_mcp/server.py

@@ -810,6 +810,21 @@ def weekly_digest(
         return "\n".join(lines)
 
 
+def _pub_sort_key(pub: str) -> tuple[int, int]:
+    """Sortable (year, month) for an HPE "Published" value like "July 2026".
+
+    Plain string comparison ranks "March 2026" above "July 2026".
+    Unparseable values sort last.
+    """
+    for fmt in ("%B %Y", "%b %Y", "%B %d, %Y", "%Y-%m-%d"):
+        try:
+            d = _dt.datetime.strptime(pub.strip(), fmt)
+            return (d.year, d.month)
+        except ValueError:
+            continue
+    return (0, 0)
+
+
 @mcp.tool()
 def corpus_status() -> str:
     """Freshness + size of the knowledge base.
@@ -831,7 +846,7 @@ def corpus_status() -> str:
     for slug, b in cat.items():
         pub = (b.get("dates") or {}).get("Published")
         if pub:
-            if latest_pub is None or pub > latest_pub:
+            if latest_pub is None or _pub_sort_key(pub) > _pub_sort_key(latest_pub):
                 latest_pub = pub
             per_bundle.append((slug, pub))
     if latest_pub:
@@ -850,7 +865,7 @@ def corpus_status() -> str:
         "",
     ]
     if per_bundle:
-        per_bundle.sort(key=lambda kv: kv[1], reverse=True)
+        per_bundle.sort(key=lambda kv: _pub_sort_key(kv[1]), reverse=True)
         lines.append("## Most-recently-edited bundles (by HPE)")
         for slug, when in per_bundle[:5]:
             b = cat.get(slug, {})