docs: add jsdocs comments for all functions

[nartc]

closes #18

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✅ Successfully ran 4 targets

• nx affected --target=build --parallel=3
• nx affected --target=lint --parallel=3
• nx affected --target=test --parallel=3 --ci --code-coverage
• nx-cloud record -- pnpm exec nx format:check

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[eneajaho]

LGTM