Cover the netpolicy fetch contract, pin mutation controls for auth, config, tls and portmux, and check the mutmut version

[Matlan1]

Summary

• Tests for the arguments and results of safe_fetch_bytes, safe_fetch, _body_chunks and web_search in localm/netpolicy.py.
• Mutation controls for auth, config, tls and portmux: an empty, unknown or expired API key accepted, skipped cache containment, disabled or inverted TLS verification, and a certificate-holding server serving plain HTTP.
• scripts/check_mutation_floors.py fails when the installed mutmut version differs from the one the baseline records.
• Four mutants that no test can distinguish from the original are classified equivalent in scripts/mutation_baseline.json.

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