release v1.2.10

[deftio]

Summary

• Fix issue Markdown URL Parsing Bug #3: underscores (and other emphasis markers) in URLs were being interpreted as formatting (_mytest_ → <em>mytest</em> inside href/src attributes)
• Protect rendered HTML tags with placeholders before running emphasis regexes, restore after — 6 lines, zero size impact
• Add 45+ coverage tests for quikdown_bd.esm.js (now 100% statements/functions/lines)
• Add issue Markdown URL Parsing Bug #3 regression tests across all parsers (quikdown, ast, json, yaml, ast_html)
• Bump deps: dompurify, rollup, three, typescript
• Archive the character-walking scanner experiment in dev/scanner/

Bundle sizes

Module	v1.2.9	This PR	Delta
Core	9.5 KB	9.8 KB	+0.3 KB
Bidirectional	15.4 KB	14.6 KB	-0.8 KB
Editor	84.0 KB	84.3 KB	+0.3 KB

Test plan

• 1911 tests pass (npm test)
• quikdown.esm.js — 100% coverage (all metrics)
• quikdown_bd.esm.js — 100% stmts/funcs/lines, 97.8% branches
• All coverage thresholds met
• Verify URLs with underscores render correctly: [Link](https://example.org/file_mytest_123.pdf)
• Verify emphasis in link text still works: [click _here_](url)
• ESLint clean

Co-authored-by: Jacob Benson jacob@qalius.com

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