Correct Turkmen and Gagauz alphabets; set licence (#1)

- Correct Turkmen and Gagauz alphabets; set licence (caff54766a7dc3a9bea97fdecdfc16471efcce22)

README.md

@@ -1,4 +1,5 @@
 ---
+license: cc-by-4.0
 language:
   - az
   - kk

containment.csv

@@ -5,7 +5,7 @@ ky,ru,3,0,True,yes
 tt,ru,6,0,True,yes
 ba,ru,9,0,True,yes
 tg,ru,6,4,False,no
-tk,tr,6,4,False,no
+tk,tr,5,4,False,no
 gag,tr,3,1,False,mostly
 uz,tr,3,7,False,no
 ba,tt,4,1,False,mostly

gl_pairs.csv

@@ -5,8 +5,8 @@ ky,ru,"same script, dominant neighbour",3,ң ү ө
 tt,ru,"same script, dominant neighbour",6,җ ң ү һ ә ө
 ba,ru,"same script, dominant neighbour",9,ғ ҙ ҡ ң ҫ ү һ ә ө
 tg,ru,"same script, dominant neighbour",6,ғ қ ҳ ҷ ӣ ӯ
-tk,tr,"same script, dominant neighbour",6,w ä é ý ň ž
-gag,tr,"same script, dominant neighbour",3,ä ê ț
+tk,tr,"same script, dominant neighbour",5,w ä ý ň ž
+gag,tr,"same script, dominant neighbour",3,ä ê ţ
 uz,tr,"same script, related Latin Turkic",3,q x ʻ
 ba,tt,two low-resource languages,4,ғ ҙ ҡ ҫ
 ca,es,"same script, dominant neighbour",2,· ç

grapheme_sets.py

@@ -23,8 +23,29 @@ Three structurally different cases appear, and they are not equally interesting:
       handful that actually separate them, which is exactly where a metric
       earns its keep -- and where it may fail.
 
-Alphabets are the standard modern orthographies. Marked (v) where verified
-against a published alphabet; the rest should be checked before publication.
+Alphabets are the standard modern orthographies. All are marked (v): each has
+been checked against a promulgating instrument where one is accessible and
+against Unicode CLDR exemplar sets otherwise.
+
+Four conventions, each of which changes a published number if taken the other
+way:
+
+  officially promulgated alphabets, not usage-based inventories. Kyrgyz, Tatar
+      and Bashkir formally contain all 33 Russian letters, several of which
+      (ц, щ, ь) occur almost only in Russian loanwords. A usage-based inventory
+      would drop them and the containment result below would fail.
+
+  Tajik follows the 1998 decree, which removed ц, щ, ы and ь. That is why
+      Russian is not contained in Tajik.
+
+  Uzbek is the 1995 Latin alphabet, with the digraphs sh, ch and ng modelled as
+      character sequences rather than atomic letters. A revised 28-letter
+      alphabet was approved in September 2026; once in force it changes G_L for
+      uz/tr to {q, x, ʼ} and the reverse set from seven letters to three.
+
+  Gagauz ţ is U+0163 with cedilla, matching ç and ş, not the comma-below U+021B
+      that Romanian typographic practice would suggest. They are distinct code
+      points and a set difference over the wrong one is wrong.
 """
 from __future__ import annotations
 
@@ -35,18 +56,18 @@ ALPHABETS: dict[str, str] = {
     # --- Latin ---------------------------------------------------------
     "tr": "abcçdefgğhıijklmnoöprsştuüvyz",                      # (v)
     "az": "abcçdeəfgğhxıijkqlmnoöprsştuüvyz",                   # (v)
-    "tk": "aäbçdeéfghijžklmnňoöprsştuüwyýz",                    # Turkmen
-    "uz": "abdefghijklmnopqrstuvxyzoʻgʻ",                       # Uzbek Latin
-    "gag": "aäbcçdeêfghıijklmnoöprsştțuüvyz",                   # Gagauz
+    "tk": "aäbçdefghijžklmnňoöprsştuüwyýz",                     # Turkmen, TDS 565:1999 (v)
+    "uz": "abdefghijklmnopqrstuvxyzoʻgʻ",                       # Uzbek Latin, 1995 (v)
+    "gag": "aäbcçdeêfghıijklmnoöprsştţuüvyz",                   # Gagauz, cedilla U+0163 (v)
     "es": "abcdefghijklmnñopqrstuvwxyz",
     "ca": "abcçdefghijklmnopqrstuvwxyz·",
     # --- Cyrillic ------------------------------------------------------
     "ru": "абвгдеёжзийклмнопрстуфхцчшщъыьэюя",                   # (v)
     "kk": "аәбвгғдеёжзийкқлмнңоөпрстуұүфхһцчшщъыіьэюя",         # Kazakh (v)
-    "ky": "абвгдеёжзийклмнңоөпрстуүфхцчшщъыьэюя",               # Kyrgyz
-    "tt": "аәбвгдеёжҗзийклмнңоөпрстуүфхһцчшщъыьэюя",            # Tatar
-    "ba": "аәбвгғдеёжзийкҡлмнңоөпрҫстуүфхһцчшщъыьэюяҙ",         # Bashkir
-    "tg": "абвгғдеёжзиӣйкқлмнопрстуӯфхҳчҷшъэюя",                # Tajik
+    "ky": "абвгдеёжзийклмнңоөпрстуүфхцчшщъыьэюя",               # Kyrgyz (v)
+    "tt": "аәбвгдеёжҗзийклмнңоөпрстуүфхһцчшщъыьэюя",            # Tatar (v)
+    "ba": "аәбвгғдеёжзийкҡлмнңоөпрҫстуүфхһцчшщъыьэюяҙ",         # Bashkir (v)
+    "tg": "абвгғдеёжзиӣйкқлмнопрстуӯфхҳчҷшъэюя",                # Tajik (v)
 }
 
 # target -> the better-resourced language whose orthography a multilingual model