docs: per-OS instructions for enabling META_MUSE_USER_AGENT

[BlockedPath]

Docs-only. Adds a per-OS table to the README's Contributor max (opt-in) section: macOS zsh, Linux bash, fish, and Windows PowerShell, plus how to disable it. It explains that only new terminals pick up the variable, and that the fixed linux-x86_64 User-Agent isn't platform-checked (accepted from Windows; oh-my-pi sends the same string everywhere). No code changes.

[coderabbitai]

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