Fix the lint findings bolt 1.8.0 reports (rules lowered to warn)

[noah-emp]

Moving [tools.bolt] to v1.8.0 (#11) turned up findings the old bolt pin never reported. To land the tooling upgrade, the rules below are set to warn in bolt.bend; their groups stay at error for every other rule. Fix the findings, then delete those def <rule>() lines to restore error.

By rule:

• 188 × S004
• 169 × L002
• 83 × S003
• 5 × L001

By file (top 12):

• 171 ./ezhttp/LAWS.bend
• 85 ./ezhttp/http.bend
• 50 ./bench/main.bend
• 46 ./ezhttp/cookie.bend
• 21 ./ezhttp/cache.bend
• 16 ./ezhttp/cors.bend
• 12 ./ezhttp/b64.bend
• 10 ./ezhttp/client.bend
• 9 ./ezhttp/server.bend
• 9 ./ezhttp/main.bend
• 5 ./ezhttp/body.bend
• 4 ./ezhttp/url.bend

Reproduce: nix flake check (lint), or bolt --gpu off at the repo root with bolt v1.8.0.

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