Adds a build-only script that syncs src/ into an existing Vitis
workspace and rebuilds the app without recreating the platform/BSP.
Faster than re-running checkout.py for iterative src/ edits.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Discovers build artifacts (bitstream, FSBL, app ELF, XSA) from the ws/
and src/ directories and programs a connected Zynq-7000 board using the
xsdb Python API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Removes sw and sw/scripts as nested submodules; all source files are now
tracked directly in ragtag. Based on Digilent/Zybo-Z7-SW @ 06f2b4d and
digilent-vitis-scripts @ branch new_vitis/dev2024.1.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

This commit brings in all potential aspects of a project. For projects that don't have a os or sw part, their commits will be set at the root commit of the submodule