fix: escape all control characters in TOML basic strings#7
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escapeTomlBasicString only handled \b \t \n \f \r but not other control characters in U+0000-U+001F and U+007F. Per the TOML spec, basic strings may only contain certain escape sequences; unescaped control chars produce invalid TOML that smol-toml cannot parse, silently corrupting the config on next load. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
escapeTomlBasicStringonly handled\b,\t,\n,\f,\rbut not other control characters in U+0000-U+001F and U+007Fsmol-tomlcannot parse\uXXXXsequencesTest plan
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