README and CONTRIBUTING disagree on reward-claim email source

[albertoblancas123]

README.md and CONTRIBUTING.md currently give different instructions for the email address to use when claiming an accepted reward.

Steps to reproduce:

1. Open README.md and read the Rewards section.
2. Open CONTRIBUTING.md and read the Claiming a Reward section.
3. Compare the claim-email wording.

Actual result:

• README.md says to email bugs@apn.tech "from the address tied to your report".
• CONTRIBUTING.md says to email bugs@apn.tech "from the email address registered to your GitHub account".

Expected result:
Both files should describe the same claim-email requirement, so reporters know exactly which address will be accepted before they file or claim a reward.

Why this matters:
For GitHub issues, the reporter email is not visible in the issue itself. A reporter following README.md can reasonably interpret "address tied to your report" differently from the GitHub-account requirement in CONTRIBUTING.md. That creates a small but real claim-flow ambiguity after a reward label is attached.

Context:
This looks like a regression/partial drift after the earlier clarification work in #28, where CONTRIBUTING.md was updated to use the GitHub-account wording, but README.md still uses the older "address tied to your report" wording.

Suggested fix:
Update README.md to match CONTRIBUTING.md, or explicitly split the two flows if direct /bug reports and GitHub issue reports intentionally use different claim-email rules.