- debug-server.ps1: look up the core target by name ([lindex [target names] 0])
instead of hard-coding rp2350.dap.core0, which differs across OpenOCD builds.
- flash.ps1: resolve the .bin to an absolute, forward-slash, braced path so
OpenOCD's Tcl parser does not eat the backslash in \build\...
Tested on Windows.