cm45t3r / candlestick / 27384884975

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fix(utils): strengthen ensurePrecomputed guard against non-numeric bodyLen (#84)

Checking !== undefined accepted strings, null, and ratio values from external
feeds, causing pattern functions to silently operate on wrong geometry values.
Changed to typeof === 'number' so only properly enriched candles bypass
recomputation.

Added five tests: raw candles get enriched, enriched candles are returned
as-is, and the two reported failure modes (string bodyLen, null bodyLen)
now trigger correct recomputation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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