infocmp -C: don't mark a bare %? verbatim cap obsolete

The ".." obsolete marker tracks parameter/arithmetic usage (%p/%+/%-/%*), not a
conditional operator on its own: a value like is3=\E%? (a bare %? with no parameter
or conditional body) is copied through unmarked, as ncurses does (wy350 i2).

terminfo -1 100%; tests green; termcap (-C) content 82.0%.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CbiPgWC3PHKmrTNvZzXcWQ

Author: claude

crates/ncurses-tools/src/bin/infocmp.rs

@@ -669,14 +669,14 @@ fn drop_acs_for_consistency(ti: &Terminfo) -> bool {
 }
 
 /// Build a termcap field `code=value`. A value kept verbatim (untranslatable) is prefixed with `..`
-/// only when it references a parameter or uses arithmetic/conditional ops (`%p`/`%+`/`%-`/`%*`/`%?`/
-/// `%t`/`%e`/`%;`): ncurses marks such caps obsolete, but copies through non-parameterized exotica
-/// (`%g`/`%P`/`%^`/`%{`/unknown ops) unmarked.
+/// only when it references a parameter or uses arithmetic (`%p`/`%+`/`%-`/`%*`): ncurses marks such
+/// caps obsolete, but copies through non-parameterized exotica (`%g`/`%P`/`%^`/`%{`, a bare `%?`
+/// without a conditional body, unknown ops) unmarked.
 fn tc_field(code: &str, raw: &[u8]) -> String {
     let (val, verbatim) = tc_xlat(raw);
     let marks_obsolete = raw
         .windows(2)
-        .any(|w| w[0] == b'%' && matches!(w[1], b'p' | b'+' | b'-' | b'*' | b'?' | b't' | b'e' | b';'));
+        .any(|w| w[0] == b'%' && matches!(w[1], b'p' | b'+' | b'-' | b'*'));
     let prefix = if verbatim && marks_obsolete { ".." } else { "" };
     format!("{prefix}{code}={val}")
 }