[KSAGlory]

Summary

• Return the full source as the body when a document has no frontmatter block.
• Discard empty frontmatter delimiters in JavaScript and Go, including when the template body is empty.
• Use Python's current frontmatter identification logic and preserve its validation behavior.
• Document the optional frontmatter contract and add regression tests.

Testing

• JavaScript: 317 tests passed with coverage; TypeScript checking passed on Node.js 24.
• Python: 496 tests and 512 subtests passed on Python 3.12, including the parser validation tests.
• Go: both dotprompt packages passed; go vet passed.
• Formatting, import ordering, license headers, and git diff --check passed for the changed files.
• ty passed for dotpromptz source and tests. Pyrefly passed for the changed files.

Testing limitations

The broader dotpromptz Pyrefly check reports three errors in unchanged upstream _dotprompt.py and _typing.py. The full CI platform/version matrix and complete scripts/lint pipeline were not run locally. The existing failed CLA result still needs a fresh check.

Fixes #495

[google-cla]

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[KSAGlory]

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[KSAGlory]

@googlebot rescan