[dydx404]

Summary

• Add a researched CW learner guidebook under docs/guidebook/.
• Link the guidebook from the README so beginners have an obvious entry point.
• Update Codex status for the in-flight guidebook work.

Research covered

The guide references ARRL learning material and W1AW practice, CWops CW Academy, LCWO, Morse Code Ninja, Long Island CW Club, Morse Code World ICR, RufzXP, Morse Runner, ITU-R M.1677, FOC, The Art and Skill of Radio-Telegraphy, and Zen and the Art of Radiotelegraphy.

Product-law review

• Sound-first throughout.
• No character pattern table or visible code-sequence teaching material added.
• The opt-in reference is described as a dictionary-like aid, not as the learning path.

Validation

• npm run typecheck
• npm test
• npm run lint
• npm run build

Closes #91