[velis74]

• Adds markdownlint-cli2 with .markdownlint-cli2.jsonc: the default rules, line length 120 (tables and code blocks excluded), MD024 limited to sibling headings for the changelog's repeated Added / Changed / Removed and the readme's two Run-time keys sections under different parents.
• scripts/lint.mjs runs eslint, markdownlint-cli2 and vue-tsc; lint:ci is removed and CI runs npm run lint. npm run lint only reports; npm run lint -- --fix (or npm run lint --fix, which npm passes on as npm_config_fix) also applies the eslint and markdownlint fixes.
• .claude/settings.json: a PostToolUse hook lints each edited markdown file and reports the findings immediately.
• Fixes the existing findings: blank lines below headings in the changelog. The changelog changes are formatting only.

[github-actions]

✅ Incremental coverage — nothing to grade

No executable lines were changed between main and markdownlint.

7 files not graded (1 ignored by pattern, 6 not source files)

File	Reason
.claude/settings.json	not a source file
.github/workflows/ci.yml	not a source file
.markdownlint-cli2.jsonc	not a source file
changelog.md	not a source file
package-lock.json	not a source file
package.json	not a source file
scripts/lint.mjs	ignored by scripts/**

_{Coverage reports: coverage/coverage-final.json (istanbul, 1 file) — incremental-coverage-check v3.0.0}