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Summary

Adds fuzz coverage for the production Go parser implementation:

• FuzzTellSourceParserNoPanic exercises full statement/block parsing on valid, malformed, Unicode, CRLF, and arbitrary-byte source.
• FuzzTellExpressionParserNoPanic exercises the production lexer, Pratt parser, and expression AST builder.
• Linux CI runs each target for 10 seconds with two workers after Go tests/vet and before Python/conformance/package validation.

Validation

Latest branch-head checks:

• Go tests and vet: passed
• Both parser fuzz sessions: passed
• Python unittest suite: passed
• Smoke and full runtime-v1 cross-runtime conformance: passed
• Linux tarball, DEB and RPM packaging: passed
• Windows Go build and Inno Setup installer compile: passed
• macOS universal package job: queued at branch-head validation (this PR changes no package scripts; macOS package validation has passed on recent migration heads).