[fy-god]

Closes #26

What changed

• Validate bytes32ToStellarAddress input as an exact 0x-prefixed 32-byte hexadecimal value before decoding.
• Reject non-hex, odd-length, wrong-length, and missing-prefix input instead of allowing Buffer.from to silently truncate it.
• Document that raw bytes32 values do not carry enough type information to reconstruct a C... contract strkey; callers must retain the original contract address.
• Add mocked unit coverage for every invalid-input class while preserving G-address round trips.

Verification

• pnpm test — 9 files, 116 tests passed
• pnpm run typecheck
• pnpm run build

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