fix: accept request --no-proxy flag

[alexrisch]

Changes

• Route tempo request --no-proxy around Incur's --no-foo negation parser so it is not treated as proxy=false.
• Keep the public help/describe spelling as --no-proxy.
• Add request parser coverage and a patch changelog entry.

Testing

• pnpm check:format
• pnpm typecheck
• pnpm exec vitest run test/request.test.ts
• pnpm changelog:validate
• Manual: pnpm exec tsx src/request-cli.ts --no-proxy --dry-run http://example.com

Note: origin/main currently has an unrelated test/cli-describe.test.ts failure because package.json is 0.6.2 while src/shared/constants.ts defaults to 0.6.1.