feat: allow " inside triple-quoted GStrings

76.1% -> 77.2% parse rate. interpolated_triple_quoted_string used
string_content (/[^$"\\]+/), which stopped at any double quote, so a
YAML-style versions block inside a script string broke:
    """
    "${task.process}":
        tool: ...
    """
New triple_string_content token only stops at the closing """, $ and \\,
so lone/doubled quotes are ordinary content.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XaTroL9k3feq3MTAptE9bD

Author: edmundmiller

ROADMAP.md

@@ -24,7 +24,8 @@ NEXTFLOW_TS_LIB=lib/<platform>/libnextflow.<ext> \
 | 2026-07-02 | 0% (effectively)              | before directive/expression support        |
 | 2026-07-02 | 50.0% (1035/2070)             | after PR #22 (directives, ternary, …)      |
 | 2026-07-02 | 66.4% (1374/2070)             | Phase 1 lexer items (floats, escapes, …)   |
-| 2026-07-03 | **76.1% (1575/2070)**         | newline-terminator external scanner        |
+| 2026-07-03 | 76.1% (1575/2070)             | newline-terminator external scanner        |
+| 2026-07-03 | **77.2% (1598/2070)**         | " inside triple-quoted GStrings            |
 
 A file counts only if it has **zero** ERROR nodes — that is the bar
 nf-core/tools uses to trust structural matching over regex fallback

grammar.js

@@ -903,13 +903,17 @@ module.exports = grammar({
     interpolated_triple_quoted_string: $ => seq(
       '"""',
       repeat(choice(
-        $.string_content,
+        $.triple_string_content,
         $.escape_sequence,
         $.interpolation
       )),
       '"""'
     ),
 
+    // Content inside a triple-quoted GString: any run avoiding $ (interpolation),
+    // backslash (escape) and the closing """, but a lone or doubled " is fine.
+    triple_string_content: $ => token(prec(-1, /([^$"\\]|"[^"$\\]|""[^"$\\])+/)),
+
     // Plain triple-quoted strings (heredoc without interpolation)
     // Single quotes: '''literal text''' (never interpolated)
     // Double quotes: """literal text""" (only if no $ present)