Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

- Parse --rootless flag (plus any flags before VERSION) with a full arg scan
  instead of ${@:2} so --rootless works in any argument position
- Override INSTALL_DIR to ${HOME}/.local/bin in rootless mode
- Add maybe_sudo() wrapper that skips sudo when ROOTLESS=true
- Add preflight check for writable install directory in rootless mode
- Replace all sudo calls (chown, find, install, tar, chmod) with maybe_sudo
- Add GITHUB_PATH export after fresh-download install in rootless mode
- Use direct binary path for verification in rootless mode
Add install_copilot_cli_test.sh with 10 tests covering:
- Flag parsing in all argument positions
- INSTALL_DIR override for rootless/non-rootless modes
- GITHUB_PATH export and missing-GITHUB_PATH warning
- maybe_sudo behavior in both modes
Update docs to document --rootless and remove the
'allowPrivilegeEscalation: false is not supported' known limitation
Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

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