polish: complete the RGL enough to build an application grammar

Adding Polish to informath (grammars/next) exposed a set of gaps. Unlike
Czech, StructuralPol was already complete; what was missing was a handful
of lins, a way to govern the nominative, and some outright mistakes.

Missing lins, all reached as qualified Grammar.X by the application's
functors and so not shimmable from the application side:

  AdjectivePol  AdvAP
  SentencePol   SSubjS
  IdiomPol      ImpP3
  StructuralPol that_Subj
  MarkupPol     new module (Markup is not part of the RGL build script,
                so it is compiled on demand, as MarkupCze is)
  ParadigmsPol  mkAdv (every other ParadigmsX has it; the application
                interfaces reach it as Paradigms.mkAdv)

ImpP3 has no third-person imperative to use, so it takes the standard
"niech" periphrasis. The copula takes the future ("niech x będzie grupą")
and every other verb the present ("niech x należy do A"): być is the only
Polish verb with a synthetic future, and imienne marks exactly the copular
VPs.

NomPrep: ComplCase had no nominative at all, so "jako", "niż" and
"zdefiniowany jako" -- all of which govern the nominative -- came out
locative ("mniejszy niż liczbie"). mkCompl now maps Nom to a new NomPrep,
and the dep tables of the pronouns, nounPN, mkPN and the structural NPs
cover it. LexiconNounPol is marked DO NOT EDIT, but paris_PN and john_PN
inline their own dep tables and so had to be extended too.

Two corrections:

  VerbPol.CompCN used the nominative for a predicative noun, giving
  "x jest grupa"; Polish uses the instrumental, as CompNP right below it
  already does.

  ExtendPol.ExistsNP inherited ExistNP from ExtendFunctor, giving
  "jest macierz". Polish distinguishes the two: "there exists" is istnieć,
  which is what mathematical prose uses.

ParadigmsPol.guess_paradigm_basic never matched -ość, the productive
feminine abstract suffix, so sprzeczność took a masculine declension
(*sprzeczności/a, *sprzecznościowi) despite being tagged feminine. It now
routes to the kość paradigm.

Also documents, without changing, why the 2-string mkN throws its genitive
away: guess_paradigm's 2-string table is unsound (its first branch matches
every noun in -a, and its branches disagree about whether mkNTable* takes
the nominative or the bare stem), so passing sggen to it turns
"liczba"/"liczby" into *liczbaa. The 1-string guesser is the sound path
until that table is repaired.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/polish/MorphoPol.gf

@@ -60,6 +60,7 @@ oper
       nom = "wszyscy" ;
       voc = "wszyscy" ;
       dep = table {
+        NomPrep => "wszyscy";
         (GenNoPrep|GenPrep) => "wszystkich";
         (DatNoPrep|DatPrep) => "wszystkim";
         (AccNoPrep|AccPrep) => "wszystkich";
@@ -74,6 +75,7 @@ oper
       nom = "wszystko" ;
       voc = "wszystko" ;
       dep = table {
+        NomPrep => "wszystko";
         (GenNoPrep|GenPrep) => "wszystkiego";
         (DatNoPrep|DatPrep) => "wszystkiemu";
         (AccNoPrep|AccPrep) => "wszystko";
@@ -88,6 +90,7 @@ oper
       nom = "ktoś" ;
       voc = "ktosiu" ;
       dep = table {
+        NomPrep => "ktoś";
 	     (GenNoPrep|GenPrep) => "kogoś";
 	     (DatNoPrep|DatPrep) => "komuś";
 	     (AccNoPrep|AccPrep) => "kogoś";
@@ -102,6 +105,7 @@ oper
       nom = "coś" ;
       voc = "coś" ;
       dep = table {
+        NomPrep => "coś";
 	     (GenNoPrep|GenPrep) => "czegoś";
 	     (DatNoPrep|DatPrep) => "czemuś";
 	     (AccNoPrep|AccPrep) => "coś";
@@ -117,6 +121,7 @@ oper
       nom = "kto" ;
       voc = "kto" ;
       dep = table {
+        NomPrep => "kto";
 	     (GenNoPrep|GenPrep) => "kogo";
 	     (DatNoPrep|DatPrep) => "komu";
 	     (AccNoPrep|AccPrep) => "kogo";
@@ -131,6 +136,7 @@ oper
       nom = "co" ;
       voc = "co" ;
       dep = table {
+        NomPrep => "co";
 	     (GenNoPrep|GenPrep) => "czego";
 	     (DatNoPrep|DatPrep) => "czemu";
 	     (AccNoPrep|AccPrep) => "co";
@@ -216,6 +222,7 @@ oper
   oper niktNP : NounPhrase =
 	 { voc,nom="nikt";
 	   dep = table {
+	     NomPrep => "nikt";
 	     (GenNoPrep|GenPrep) => "nikogo";
 	     (DatNoPrep|DatPrep) => "nikomu";
 	     (AccNoPrep|AccPrep) => "nikogo";
@@ -230,6 +237,7 @@ oper
   oper nicNP : NounPhrase =
 	 { voc,nom="nic";
 	   dep = table {
+	     NomPrep => "nic";
 	     (GenNoPrep|GenPrep) => "niczego";
 	     (DatNoPrep|DatPrep) => "niczemu";
 	     (AccNoPrep|AccPrep) => "nic";