content: classify all finds and reviews into the topics vocabulary

864 finds + 64 reviews assigned 1-3 topics each from the new 18-topic
controlled vocabulary (src/lib/topics.ts, lands in the next site
commit). The retired gifts topic becomes a giftable tag on the 140
finds that carried it; 5 finds legitimately match no topic.

Claude-Session: https://claude.ai/code/session_01WZaczDJjL3xZ3u5spsN5AL

src/content/find/2026/05/daphne-du-maurier-mirrors/index.mdx

@@ -4,8 +4,7 @@ date: 2026-05-13
 link: https://wordsmith.org/awad/
 linkText: "wordsmith.org"
 source: "A.Word.A.Day"
-topics:
-  - quotes
+topics: [words-and-humor]
 tags: [quote, du-maurier, self]
 description: "A.Word.A.Day's Thought for Today (May 13, 2026) — Daphne du Maurier on the simplicity of a self-image-free life."
 ---