[Bug] fix.py is a stale hardcoded stub

I will pay for a fixed file - details below. ## Bug [`fix.py`](https://github.com/Hazyshades/Sendly-Test-Repo/blob/main/fix.py) prints a hardcoded `fix #71` and always exits 0 regardless of arguments. As a utility it communicates nothing: the issue number is frozen in source and there is no argument handling. ## Acceptance criteria - [ ] Issue number taken from CLI arg (`python fix.py 77`) with usage message when missing - [ ] Non-zero exit code on missing/invalid args - [ ] Output mentions the repo, e.g. `fix Hazyshades/Sendly-Test-Repo#77` ## Reward I will pay **10 USDC (test tokens)** on **ARC Testnet** for a merged fix — same flow as #53, but payout is test USDC on ARC, not Base. How to claim: 1. Comment `/attempt` with this issue number before you start. 2. Open a PR referencing this issue (`Fixes #`). 3. After the PR is reviewed and merged, comment your **ARC testnet EVM address** here — you receive 10 test USDC on ARC.