stage(elp): consolidate scattered lang work — full-lexicon vocabulary + profiles

Backfill ELP vocabulary from FULL lexicons (UniMorph + kaikki.org Wiktionary,
real gender/inflections) for 8 languages, 812,894 entries total, in the proven
seed-fn format matching the 18 ancient vocabularies:
  es 72,032 | fr 130,517 | de 144,692 | la 22,590 | it 193,675 | pt 115,772 |
  ro 86,504 | ca 47,112
4 of these (es fr de la) backfill ELP languages that had morphology but no
vocabulary; it/pt/ro/ca are new Romance (need morphology-*.el ports next).
Adds lang_profile_* for all 8 + reproducible generators under tests/lang-gen.
Vocab is runtime seed data (not in build manifest, like the 18 ancients);
seed-fn format validated to compile to C via elc.

elp/src/lang_profile_la.el

@@ -0,0 +1,30 @@
+;;; lang_profile_la.el — Latin language profile for ELP.
+;;; Keys the realizer's construction switches. Companion to morphology-la.el.
+
+(lang_profile_la
+  (language        "Latin")
+  (iso639          "la")
+  (family          "Italic")
+
+  ;; -- core typology flags -------------------------------------------------
+  (pro-drop            yes)     ; person carried by verb ending; subjects dropped
+  (obligatory-subject  no)
+  (grammatical-gender  yes)     ; m/f/n; adjective AGREES in case+gender+number
+  (gender-source       lexicon) ; REAL per-noun gender from UniMorph lat
+  (articles            none)    ; Latin has no articles
+  (case-system         yes)     ; NOM GEN DAT ACC ABL VOC (+ rare LOC)
+  (cases               (nom gen dat acc abl voc))
+  (word-order          "SOV (default; free order, case-marked)")
+  (adjective-position  "either (case agreement carries the link)")
+  (adjective-agreement "case+gender+number")
+
+  ;; -- verb / aspect system ------------------------------------------------
+  (verb-classes        (1 2 3 3io 4))  ; four conjugations + i-stem 3rd
+  (tenses              (present imperfect future perfect pluperfect futureperfect))
+  (moods               (indicative subjunctive imperative infinitive))
+  (voices              (active passive))
+  (finite-agreement    "person+number (6 slots)")
+  (citation            "principal parts: pres-1sg / pres-inf / perf-participle")
+
+  ;; -- SACRED safety bar ---------------------------------------------------
+  (negation-faithful   yes))     ; polarity never dropped/inverted