Drop substantivized-adjective false nouns via manual_reject.txt

OpenCorpora/libmorph hand a noun reading to Stage 2 above the РАН note, so
substantivized-adjective false nouns a dictionary misreads (нёбный, акцизный,
велярный, …) reached scrabble.txt with no veto path — the earlier abbreviation
filter only carved out Abbr+Fixd.

ru_stage2.py now subtracts sources/scrabble_ru/manual_reject.txt last, after
every admission path (OC seed / libmorph / note / manual_confirm / variant),
mirroring manual_confirm.txt. The list seeds 62 hand-reviewed words — 43 pure
adjectives plus 19 marginal (slang/archaic/jargon) substantivizations; genuine
substantivized nouns (больной, знакомый, учёный, участковый, …) stay.

scrabble.txt -62 (83206->83144); erudit.txt re-folded -62. The DAWGs are
gitignored and rebuild from these lists in CI.

tools/ru_stage2.py

@@ -353,7 +353,15 @@ def build():
                     fate[y] = f"scrabble: вариант от «{x}» (через «и»)"
                     changed = True
 
-    undefined = [w for w in amb if w not in scrabble]
+    # Manual rejections: words the maintainer vetoed — substantivized-adjective false nouns
+    # a dictionary misreads as nouns (нёбный, акцизный, …). Subtracted last, so it overrides
+    # every admission path above (OC seed / libmorph / note / manual_confirm / variant).
+    reject = {w for w in load(os.path.join(OUT_DIR, "manual_reject.txt")) if cyr_ok(w)}
+    scrabble -= reject
+    for w in reject:
+        fate[w] = "отброшено: ручной запрет (manual_reject.txt)"
+
+    undefined = [w for w in amb if w not in scrabble and w not in reject]
     return {
         "oc": oc, "scrabble": scrabble, "undefined": undefined,
         "adjectives": adj, "verbs": verb, "singulars": ed_nouns,