perf: Optimize parser safety and rendering consistency

[Fuyeors]

Summary

• Bound recursive block and inline parsing depth and make parser IDs deterministic within each document.
• Cache inline token positions and fenced block extraction to avoid repeated scans on hostile or repeated inputs.
• Validate link protocols and color values at parser and renderer boundaries, with consistent core, Lit, and Vue output.
• Add FFM regression coverage, strict library/test typecheck configs, reproducible ESM build output, and CI quality gates.

Validation

• pnpm install --frozen-lockfile --ignore-scripts
• pnpm --filter @fuyeor/markdown-parser typecheck
• pnpm --filter @fuyeor/markdown-parser test:unit
• pnpm --filter @fuyeor/markdown-parser test:ffm
• pnpm --filter @fuyeor/markdown-parser build
• Strict standalone typechecks for Lit and Vue renderers
• pnpm --filter @fuyeor/markdown-parser-playground build
• git diff --check

The existing full CommonMark/GitHub compatibility corpus remains a separate compatibility suite because it contains pre-existing specification mismatches outside this focused change.

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Project	Deployment	Actions	Updated (UTC)
markdown-parser-playground	Error		Aug 18, 2026 11:48pm