Migrate all project files from repo root into prj/<name>/

Moved all 40 existing projects' .prj/.dat files (Layer weights, training
batches, legacy .weights.dat/.test.dat artifacts) from the flat repo root
into their own prj/<name>/ folder via git mv, matching the new path
convention from the previous commit. Filenames are unchanged, only the
directory. Non-project files at root (CLAUDE.md, Makefile, batch/moby
text corpora, the stray Layer.0.training.mat) were left in place.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016K8Gu7Qejd11JbdiHZqYAs

prj/serano_c/serano_c.Layer.0.w.dat

@@ -0,0 +1,7 @@
+ARMA_MAT_TXT_FN008
+5 2
+   4.7636048953128558e+00   1.1464774694266769e+01
+  -5.8683594060514874e+00  -1.1467260181388543e+01
+   4.7625338920318860e+00   1.1464835655942204e+01
+  -8.1086818045775573e+00   6.7797136255234175e-02
+  -9.9713468814234041e+00  -1.0439701028698969e+00