NJ-Kit 2.4.3

• Dead-code sweep. Knip 5 (JS/TS) and vulture (Python, confidence ≥ 90) over the whole repo; every finding checked by hand before a change.
• pdf-typography: removed scripts/--help and scripts/--help.pages.json, a PDF and its page map written by running the renderer with --help as the output name; they had shipped since 2.0.0.
• nj-motion-deck template: Root.tsx takes the frame rate from theme.ts's FPS instead of a second literal 30; Slide.tsx's Props type is module-private (only that file uses it).
• nj-evidence/scripts/kb.py: two … if False else None statements that never ran removed from the self-test.
• nj-writer/reference/arabic-tashkeel/evidence/corpus.py: a re.sub whose replacement always returned the match (a no-op) removed.
• tests/test_v3.py: an unused import re as _re removed.
• Left as they are: arabic-english-proofreading/scripts/pdf-structure.py render_page(..., has_table) keeps its unused parameter (callers pass it; signature kept); the Knip notes from 2.4.2 still hold.