czech: implement three-place verbs (V3)

Add a proper V3 category to the Czech RGL, previously absent (V3 fell
through to the {s:Str} default and Slash2V3/Slash3V3 were notYet stubs).

- CatCze: lincat V3 = VerbForms ** {c, c2 : ComplementCase}; extend
  VPSlash with a trailing `ind` field for the incorporated indirect
  object (mirrors the English VPSlash c2 field).
- VerbCze: implement Slash2V3 and Slash3V3; ComplSlash now renders the
  `ind` string after the object slot, and SlashV2a sets ind = []. This
  keeps the object before the indirect object under the shared
  ComplV3 v o d = ComplSlash (Slash3V3 v d) o.
- ParadigmsCze: add the mkV3 paradigm (default acc/dat, plus an
  explicit two-complement-case form).
- MissingCze: drop the now-implemented Slash2V3/Slash3V3 stubs.

V2 predication is unchanged (ind is empty for V2-derived VPSlash).

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

src/czech/CatCze.gf

@@ -21,9 +21,10 @@ concrete CatCze of Cat =
     RP  = AdjForms ;
 
     VP = {verb : VerbForms ; clit,compl : Agr => Str} ; ---- more fields probably needed
-    VPSlash = {verb : VerbForms ; clit,compl : Agr => Str ; c : ComplementCase} ; ----
+    VPSlash = {verb : VerbForms ; clit,compl : Agr => Str ; c : ComplementCase ; ind : Agr => Str} ; -- ind : incorporated indirect object, rendered after the object slot
     V  = ResCze.VerbForms ;
     V2 = ResCze.VerbForms ** {c : ComplementCase} ;
+    V3 = ResCze.VerbForms ** {c,c2 : ComplementCase} ; -- c : direct object, c2 : indirect object
     VS,VQ,VV = ResCze.VerbForms ;
 
     A  = ResCze.AdjForms ;

src/czech/MissingCze.gf

@@ -61,8 +61,6 @@ oper RelNP : NP -> RS -> NP = notYet "RelNP" ;
 oper RelSlash : RP -> ClSlash -> RCl = notYet "RelSlash" ;
 oper SentAP : AP -> SC -> AP = notYet "SentAP" ;
 oper SentCN : CN -> SC -> CN = notYet "SentCN" ;
-oper Slash2V3 : V3 -> NP -> VPSlash = notYet "Slash2V3" ;
-oper Slash3V3 : V3 -> NP -> VPSlash = notYet "Slash3V3" ;
 oper SlashPrep : Cl -> Prep -> ClSlash = notYet "SlashPrep" ;
 oper SlashV2A : V2A -> AP -> VPSlash = notYet "SlashV2A" ;
 oper SlashV2Q : V2Q -> QS -> VPSlash = notYet "SlashV2Q" ;

src/czech/ParadigmsCze.gf

@@ -122,6 +122,14 @@ oper
       = \vf,c -> vf ** {c = c} ;
     } ;
 
+  mkV3 = overload {
+    mkV3 : VerbForms -> VerbForms ** {c,c2 : ComplementCase}
+      = \vf -> vf ** {c = {s = [] ; c = Acc ; hasPrep = False} ;
+                      c2 = {s = [] ; c = Dat ; hasPrep = False}} ;
+    mkV3 : VerbForms -> ComplementCase -> ComplementCase -> VerbForms ** {c,c2 : ComplementCase}
+      = \vf,c,c2 -> vf ** {c = c ; c2 = c2} ;
+    } ;
+
 ------------------------
 -- Adverbs, prepositions, conjunctions, ...
 

src/czech/VerbCze.gf

@@ -8,17 +8,35 @@ lin
     
     ComplSlash vps np = case <np.hasClit, vps.c.hasPrep> of {
       <True,False> => vps ** {
-        clit = \\a => vps.clit ! a ++ np.clit ! vps.c.c
+        clit = \\a => vps.clit ! a ++ np.clit ! vps.c.c ;
+        compl = \\a => vps.compl ! a ++ vps.ind ! a
         } ;
       _  => vps ** {
-        compl = \\a => vps.compl ! a ++ vps.c.s ++ np.s ! vps.c.c
+        compl = \\a => vps.compl ! a ++ vps.c.s ++ np.s ! vps.c.c ++ vps.ind ! a
         }
       } ;
 
     SlashV2a v = {
       verb = v ;
       clit,compl = \\_ => [] ;
-      c = v.c
+      c = v.c ;
+      ind = \\_ => []
+      } ;
+
+    -- three-place verbs: c = direct object case, c2 = indirect object case
+    Slash2V3 v np = {          -- fill the direct object, leave the indirect open
+      verb = v ;
+      clit = \\_ => [] ;
+      compl = \\_ => v.c.s ++ np.s ! v.c.c ;
+      c = v.c2 ;
+      ind = \\_ => []
+      } ;
+    Slash3V3 v np = {          -- fill the indirect object (rendered after the object slot)
+      verb = v ;
+      clit = \\_ => [] ;
+      compl = \\_ => [] ;
+      c = v.c ;
+      ind = \\_ => v.c2.s ++ np.s ! v.c2.c
       } ;
 
     UseComp comp = {