tool_operate: drop the scheme-guessing in the -G handling

[bagder]

Prior to this, -G would override the scheme set with --proto-default and revert back to guessing the scheme based on the hostname.

Add test 2008 to verify the fix

Spotted by Codex Security

[Copilot]

Pull request overview

This PR fixes curl tool -G handling so it no longer reverts to hostname-based scheme guessing when --proto-default is set, and adds a regression test to ensure the intended scheme is preserved in proxy absolute-form requests.

Changes:

• Update append2query() in src/tool_operate.c to stop reintroducing a guessed scheme when reconstructing the URL after appending query parameters.
• Add new test case test2008 to cover -G with --proto-default on a schemeless hostname that would otherwise trigger scheme guessing.
• Register test2008 in the tests data Makefile.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/data/test2008	New regression test covering -G + --proto-default behavior with proxy usage
tests/data/Makefile.am	Adds test2008 to the test suite list
src/tool_operate.c	Stops append2query() from reintroducing guessed schemes when rebuilding URLs

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[bagder]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes curl tool -G query handling so it no longer re-guesses the URL scheme, preserving the scheme implied by --proto-default.

Changes:

• Use CURLU_NO_GUESS_SCHEME when reconstructing the URL after appending query parameters.
• Add test 2008 to cover -G + --proto-default=http with a schemeless host that would otherwise be guessed as FTP.
• Register the new test in tests/data/Makefile.am.

Why: Prevents -G from overriding --proto-default by falling back to host-based protocol guessing (reported by Codex Security).

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[augmentcode]

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