[Mannerless]

Fixes #27

Summary of Changes

• Re-exports convertPrecision from src/index.ts so integrators can access decimal scaling directly without reimplementing bigint math.
• Preserves the existing doc comments on convertPrecision.
• Adds tests in tests/encoding.test.ts verifying:
  • Direct import from the root package entrypoint
  • 6->7 upscale exactness
  • 7->6 downscale truncation
  • Zero handling across all decimal targets
  • Identity preservation when source and destination decimals match
  • 6->7->6 round-trip identity preservation
  • 7->6->7 sub-micro precision truncation loss with exact differential assertions (9 units / 0.0000009 USDC)
• All 117 tests pass with zero compiler warnings and successful tsup clean build.

Settlement wallet (Base USDC): 0x459B90ea0C111ae7750EE67f5B4a5d2D506651D0

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