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/prims2/prims2.Layer.1.bh.dat

@@ -0,0 +1,3 @@
+ARMA_MAT_TXT_FN008
+1 16
+  -2.6602481946556367e+00  -2.2189881798785002e-01  -1.7347977604296794e+00  -7.1797694209226415e-01   8.9118095304286593e-01   7.5675238486834706e-01  -7.3049790338841554e+00   8.4805778627185269e-01   1.0294035816597416e+00  -1.5060786406480324e+00  -7.6724058845745988e+00   8.5138504356611389e-01   4.5361811908781418e+00   1.0360720445058365e+00   8.0212330376005774e+00  -9.3149772792492813e-01