[v1] Finish XRPL binary encoding for amount and variable-length fields #49
Description
Problem
The v1 release needs this work to make the toolkit claim defensible.
Scope
- Finish missing XRPL binary encoding pieces needed by the supported v1 transaction set.
- Focus on amount-like encodings, variable-length fields, and deterministic failure paths for unsupported field classes.
Files
- src/canonical_tx.zig
- src/types.zig
- src/serialization.zig
Gates
- Gate B
Acceptance Criteria
- Amount-like encoding is exact for supported cases.
- VL boundaries and field headers are covered by pinned vectors.
- Unsupported field classes fail deterministically.
Related
- Epic: [Epic] v1 XRPL Toolkit release #45
- Milestone: v1 XRPL Toolkit