Document existing keyboard shortcuts in docs/keyboard.md
Lane test E: add docs/keyboard.md listing the app's existing keyboard shortcuts as documented in README.md. No other change.
Outcome
Added docs/keyboard.md listing README's shortcut (Space). Per the operator, S and Enter/Escape are left out and README is unchanged. Quick gate passed; PR #16 merged. Follow-up: the docs miss S and Enter/Escape.
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