Details (original message): Advance gitlinks (frontend contracts mirror 5b6b52d) and keep the embed dir gitkeep stable across builds.
Details (original message): Assemble P1-P4: advance module gitlinks (core 992d601, backend 97b90ad, frontend), cross-repo Makefile with contracts sync and single-binary build, example plugin assets, demo target.
Details (original message): Assemble the dev integration repo: submodules, cross-repo Makefile, and repo guides.