Replace Handlebars parser with Peggy grammar for @glimmer/syntax#21308

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NullVoxPopuli-ai-agent wants to merge 14 commits intoemberjs:mainfrom

NullVoxPopuli-ai-agent:merge-handlebars-parser-into-glimmer-syntax

Commits on Apr 19, 2026

Replace Handlebars parser with Peggy grammar for @glimmer/syntax

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perf(syntax): mutate AST in place during loc conversion

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perf(syntax): use peggy .offset directly for span conversion

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style(syntax): prettier format + refresh stale Jison comment

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refactor(syntax): source HTML5 entity table from simple-html-tokenizer

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refactor(syntax): use Peggy-native error format, drop Jison shape

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feat(syntax): richer diagnostic error format

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feat(syntax): more diagnostic error messages with corrections

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fix(test): update assert-reserved-named-arguments to match new error message

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refactor(syntax): use Peggy's native error formatter for parse errors

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test(syntax): update error assertions to Peggy-native format

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Commits on Apr 20, 2026