fix(monero): quarantine broadcastTx and map fee priorities

[Thorian1te]

Summary

PR2 of the Monero wallet-rpc hardening stack (stacks on #1765):

• broadcastTx now throws — the old path returned a non-canonical keccak txid and encouraged the experimental builder; use transfer()
• Builder API — remove BuiltTransaction / related types from the package root export; docs mark tx/builder as R&D-only
• feeOption → wallet-rpc priority — Average=2, Fast=3, Fastest=4 (added optional feeOption on Monero TxParams)
• Amount precision — clearer error when amount exceeds Number.MAX_SAFE_INTEGER (JSON-RPC Number limit)

Test plan

• yarn workspace @xchainjs/xchain-monero test (131 passed)
• yarn build --filter=@xchainjs/xchain-monero

Stack

1. fix(monero): harden address, purge, and unlocked balance #1765 — address / purge / unlocked balance
2. This PR — transfer / broadcast hygiene
3. (next) multi-index wallet-rpc
4. (next) stagenet spend e2e

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 544c4dca-45aa-49e0-9ac7-713cd9e515bc

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}