Add custom glyph pools

[Ma1kovich]

Summary

• add configurable, grapheme-aware glyph pools for Binary, Decode, DNA, Glitch, and Hacker effects
• preserve existing defaults and keep Braille on its fixed visual treatment
• document the effect factories and demonstrate them in the standalone TypeScript example

User impact

Callers can create themed built-in effects with createBinaryEffect, createDecodeEffect, createDnaEffect, createGlitchEffect, or createHackerEffect. Existing singleton effects and the ordered effects array remain unchanged.

Validation

• npm run check
• npm run coverage — 257 tests; 96.97% statement coverage
• npm run release:check — build, README snippets, public surface, package dry runs, packed consumers, and standalone examples