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/test/test.Layer.1.w.dat

@@ -0,0 +1,10 @@
+ARMA_MAT_TXT_FN008
+8 4
+   1.9585414995267509e+00   8.7950019959841566e+00   1.2159659584936924e+00   1.6836280891778426e+00
+   2.9244716500744578e-01  -2.8088337921076310e+00  -9.7033468943801431e+00  -2.5695624264208834e+00
+  -8.2487118883543520e+00   2.7225357421267377e-01   3.5088647638221113e+00   3.9207168039404711e-01
+  -1.7057173403180694e+00  -3.4022233937288635e+00   6.5425466798446719e+00  -4.7470286000017579e+00
+   2.3903654202034681e+00  -6.0565587363115059e-01   9.4134300750172617e-01  -1.0383552714925854e+00
+   5.0394570542381132e+00  -5.3248504462040591e-01   3.5889273522081249e+00  -8.0634466952386816e+00
+   1.9576053435116345e+00   8.7946537158624505e+00   1.2157427750091683e+00   1.6825646900982498e+00
+   4.6374140993432853e+00  -4.3822270096518459e+00   1.4827750458864410e+00   9.6746536621347445e+00