Standing block for decisions/ma-do (#762)

docs/design/decisions/ma-do.md

@@ -1,7 +1,22 @@
 # ma-do — ambiguous acronyms by decision
 
-- 2026-07-17 (M12, Derek-approved) — ma and do joined the ambiguous acronym set because both are common surnames; the two-word "Jack Ma" is kept intact by S2's words-to-spare guard, while the periods gate governs the dotted spellings ("M.A." counts unambiguously). Documented side effect: parenthesized bare
+## Standing
+
+- `ma` and `do` are members of the ambiguous acronym set (`suffix_acronyms_ambiguous`: credential readings with `may_be_name`, `uv run python tools/vocab/query.py --word ma`), kept there because both are common surnames; the set has grown past these two since (decisions/suffix-acronym-collisions), and the marking is still what lets `Jack Ma` read family 'Ma' with `suffix-or-name` reported, while `John Smith MA` reads suffix — 2026-07-17.
+- In a name written in more than one case, a member in capitals leans credential and is taken with nothing to spare (`Jack MA`, `Jack DO` → given 'Jack', suffix 'MA'/'DO'), where `Jack Ma` keeps family 'Ma'; a deliberate break from v1, which read `Jack MA` as family 'MA' — 2026-09-15 #289.
+- A member written with its periods, one after each letter, counts unambiguously (`Jack M.A.`, `Jack D.O.` → suffix, `given-or-family` reported when only the given name remains), and one trailing period is no such spelling (`Jack Ma.` → family 'Ma.') — 2026-07-17.
+- A parenthesized bare `(MA)` or `(DO)` reads as a nickname, no longer escaping to suffix as in 1.x, and reports `suffix-or-nickname` — 2026-07-17.
+- After a family comma `do` is spelling-dependent, being the one member of the set that is also particle vocabulary: `Doe, John DO` reads suffix `DO`, while `Doe, John Do`, `Doe, John do` and `DOE, JOHN DO` attach it to the family by P6 (`Doe, John Do` → family 'Do Doe', `particle-or-given` reported); `ma` is no particle, so `Smith, John Ma` keeps middle 'Ma' and `Smith, John MA` reads suffix — 2026-09-18 #531. Comma-less under `FAMILY_FIRST`, only the Title-case spelling attaches (`Doe John Do` → given 'John', family 'Do Doe', with `particle-or-given` besides `suffix-or-name`), while `Doe John do` and `DOE JOHN DO` read suffix, so the comma and the comma-less writing disagree for `do` (rules/P6, decisions/two-input-invariants).
+
+Elsewhere: the rest of the case reading — Title-case `Ma` and `Do` leaning surname, an all-lower member or a one-case name taking the positional count (`ANH DO` → family 'DO', `JOHN SMITH MA` → suffix) — is decisions/S6's 2026-09-14 #289 + #516 entry and decisions/S4's 2026-09-15 (spec review) entry, and two shapes stand outside the case reading altogether: a particle run in front takes `do` whatever its case (`Anh van DO` → family 'van DO', reporting nothing; rules/P2, decisions/S5's 2026-09-18 (Derek), #531 — CAPITALS DECIDE FOR `do` entry), and an unambiguous credential in front of a member speaks for it (`John Smith PhD Ma` → suffix 'PhD Ma'; decisions/S7's 2026-09-27 (Derek), #544 — A CREDENTIAL RUN KEEPS ITS AMBIGUOUS MEMBERS entry); the count that goes first at the first slot after a comma, a suffix comma included (`Smith, MA` → suffix, `Smith, Ma` → given, `John Smith, Ma` → suffix), is decisions/S6's 2026-09-14 (Derek) and 2026-10-20 (Derek), #761 entries; the pairing that gives `do` its capitals-only credential reading after a family comma, and its accepted cost, is decisions/S5's 2026-09-18 (Derek), #531 — CAPITALS DECIDE FOR `do` entry; the escape that reads a bracketed member as a nickname is decisions/suffix-acronym-collisions' S1 line; the periods gate is rules/S3's since 2026-10-19; whether a word earns the ambiguous marking is decisions/vocabulary-collisions' C-i and decisions/suffix-acronym-collisions', with `do`'s departure from TITLES recorded in the former and further credentials marked ambiguous in the latter (2026-10-21 #796).
+
+Open: #792 (S1 and S8: whether a bracketed generation ends the credential run, `W. Russell (Jr.) Withers`), the neighbour of the parenthesized line above, which it does not move: `John Smith (MA) Withers` reads nickname 'MA', family 'Withers'.
+
+## Log
+
+- 2026-07-17 (M12, Derek-approved) (its `Jack Ma` sentence superseded in part by #289 below, for the all-caps spelling) — ma and do joined the ambiguous acronym set because both are common surnames; the two-word "Jack Ma" is kept intact by S2's words-to-spare guard, while the periods gate governs the dotted spellings ("M.A." counts unambiguously). Documented side effect: parenthesized bare
   "(MA)"/"(DO)" no longer escape to suffix as in 1.x.
 - 2026-09-15 #289 — AMENDS the sentence above for one spelling and leaves it standing for the other. "The two-word 'Jack Ma' is kept intact by S2's words-to-spare guard" is still true of `Jack Ma`, and false of `Jack MA`: an all-caps member of the ambiguous set inside a mixed-case name is now read as a credential with nothing to spare, so `Jack MA` gives given 'Jack', suffix 'MA' — v1's reading was last 'MA', so this is a deliberate parity break and not a restoration. The periods gate is untouched and still governs the dotted spellings. The two ledger comments that quote this sentence carry the same amendment. See decisions/S6.
 - 2026-09-18 #531 — AND `do` IS NOW SPELLING-DEPENDENT AFTER A FAMILY COMMA, which neither sentence above anticipated: it is the one member of this set that is also particle vocabulary, so `Doe, John DO` reads suffix `DO` (capitals, mixed-case name) while every other spelling attaches to the family under rules/P6. The pairing and its accepted cost are in decisions/S5's 2026-09-18 `do` bullet.
 
+

tests/v2/decisions_without_standing.json

@@ -59,7 +59,6 @@
   "comparison-surface",
   "deviates-registry",
   "differential-ledger",
-  "ma-do",
   "nfd-shapes",
   "normalization-fold",
   "parse-cost",