CP4.2: review — the default build keeps the carry-over locales embedded until Language packs ship; CRAFT_PROOF_EMBED=en is the English-only build (CP4.4); licence notices name the real built-in sources

- build.rs: unset CRAFT_PROOF_EMBED embeds de, pl, pt, it patterns and ru-extra as before (DEFAULT_EMBED); `en` embeds English and our supplements only; `de,pl` and `all` as before. Making `en` the default is CP4.4, in the release that publishes and pins language-packs-1. The default-build data tests cover pl/it/de/pt again; CI's extra step is now the English-only build.
- licence_texts: one Moby entry (the data's, else the built-in en-words.dic) and en-extra.txt (WordCraft contributors, MIT OR Apache-2.0); the deleted core-list notice is gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FypgCX8LsYYE8fsj4byBm2

.github/workflows/proof.yml

@@ -60,9 +60,9 @@ jobs:
           cargo clippy -p craft-proof --all-targets --locked -- -D warnings
           cargo test -p craft-proof --locked
           cargo check -p craft-proof --locked --target wasm32-unknown-unknown
-      - name: A Language build (CRAFT_PROOF_EMBED) with every locale embedded
+      - name: The English-only build (CRAFT_PROOF_EMBED=en, CP4.4's default once Language packs ship)
         env:
           CRAFT_I18N_DIR: ${{ github.workspace }}/craft-i18n
           CRAFT_I18N_REQUIRED: "1"
-          CRAFT_PROOF_EMBED: all
+          CRAFT_PROOF_EMBED: en
         run: cargo test -p craft-proof --locked