[KnifeLemon]

Fixes #127.

Long e-books (400+ pages) to PDF went EPUB → HWPX (built in) → PDF (rhwp) and failed after rhwp's fixed 2-minute limit, while rhwp was still rendering. Ranking calibre first didn't help: calibre had no e-book → PDF edge.

rhwp time limit follows the document

• rhwp renders text slowly. On an i7-1185G7 with rhwp 0.8.7 it takes about 1 s per KB of section XML, some 4 s per page of a novel, so a 640-page book takes ~48 min. export-hwpx and convert take seconds.
• Every rhwp run now gets 2 min + 30 min per MB of unpacked Contents/section*.xml, capped at 60 min, so a hung rhwp is still stopped. An HWP counts 3× its file size, since its text is deflated. Pictures don't raise the limit.
• The progress estimate scales the same way (15 min per MB) instead of reaching 90 % after a few seconds.
• Cancelling still stops rhwp immediately.
• A time-out fails with error.rhwp_timeout. When calibre is installed, error.rhwp_timeout_calibre suggests moving Calibre above the HWPX writer in Settings → Engines for e-books. Filee never switches engines by itself.
• LibreOffice (3 min), Ghostscript (5), Pandoc (2) and calibre (10) keep their fixed limits. calibre made the same 640-page PDF in about a minute.

calibre as an e-book → PDF engine

• New calibre edges: EPUB, MOBI, AZW3, AZW, PRC, FB2, HTMLZ, TXTZ and the formats only calibre reads → PDF, run with --paper-size a4 --pdf-page-numbers.
• Cost 23: with the default engine order the built-in route (31) still wins by one, so results don't change. Once calibre is ranked above the HWPX writer, calibre wins (≤ 31 vs ≥ 32).
• LIT, LRF and the other calibre-only formats → PDF now take one calibre run instead of calibre → EPUB → HWPX writer → rhwp.
• Engine description (en/ko/zh-CN) and docs/ENGINES.md are updated.

Tests

• Route test: the default order and calibre just below the HWPX writer keep HWPX writer → rhwp. Calibre above it, or first, gives a single calibre step (also EPUB → PNG through calibre → PDFium). DOCX is unaffected.
• calibre ranked first: EPUB → PDF end to end (A4, calibre producer, Korean text). Skips without calibre.
• rhwp text size and time limit values.
• Core 246, Cli 22, App 320, Engines 985 passed. The one Engines failure was a LibreOffice heap crash while the App tests ran at the same time; that test passes 6/6 on its own.

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