Add automatic two-line warichu across renderers and bindings

[Iktahana]

Long [[warichu:...]] annotations now form continuous two-row fragments using the first body line's remaining capacity and later lines' full capacity. The syntax and AST remain compatible; author [[br]] breaks are preserved, and automatic rows never write back to source.

Rust owns grapheme-safe splitting, kinsoku, atomic ruby/tcy/no-break/nested content, overflow reporting and UTF-8 source paths. Numeric layout calls remain supported alongside first/continuation capacity options, with thin C, Python, Swift and Kotlin/JNI interfaces. HTML, legacy HAST, EPUB and PDF use the shared rules; DOCX retains native Word combine groups. The browser controller supports invalidation, reconfiguration, settlement and disposal. Printing settles against resolved physical page dimensions, including measured font/letter-spacing advances.

The change also preserves semantic HTML table headers and formatted nested no-break parsing, both caught by consumer regressions. Public types, examples, multilingual binding documentation and changelogs are updated. Custom size, row count and manual split controls remain tracked in #85.

Local verification for fbfaf640f40e2d628fe67e8568d5dc91d9638248:

• Rust fmt, clippy, full tests/coverage and packaged crate; Python wheel/sdist installs and 27 tests at 100% coverage.
• Swift five-target XCFramework, exact binary consumer (17 tests, 99.34%) and format validators; Android two ABIs, JNI host tests, four hidden native tests and coverage gate.
• Node build/typecheck, all package coverage gates, packed Chromium/Firefox/WebKit consumers, publication contracts (65 DOCX + 9 specified rejections, 7 LibreOffice imports, 74 PDF, 7 EPUB, 3 HTML).
• Complete local downstream chain: plugin release:check/three-browser consumers passed; Illusions 629 test files, 5,587 tests and unchanged full/changed coverage gates passed, with renderer/Electron builds and two hidden warichu E2E scenarios.
• Actual A5 horizontal/vertical PDFs preserve all 720 annotation characters and 10.5pt body/5.25pt note glyphs. No Word GUI, native OS IME or EPUB reader compatibility claim is made.

This is the source candidate for the authorized npm/Rust/Python/Android publications and subsequent Swift prepare → manifest PR → publish workflow. Publication uses the established protected-branch CI and release workflows. Illusions app publication is outside this change.

[codecov]

Codecov Report

❌ Patch coverage is 95.29190% with 25 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
nodejs/packages/mdi/src/warichu-browser.ts	91.72%	6 Missing and 5 partials ⚠️
mdi-core/src/warichu.rs	97.04%	8 Missing ⚠️
nodejs/packages/mdi/src/warichu-print.ts	88.63%	2 Missing and 3 partials ⚠️
mdi-core/src/lib.rs	97.61%	1 Missing ⚠️

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