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.10.weights.dat

@@ -0,0 +1,21 @@
+8 1 4
+-0.004482
+0.003633
+0.003278
+-0.001740
+0.000354
+0.001945
+-0.004043
+0.004805
+0.000587
+0.003706
+0.003305
+0.001295
+0.000152 0.002643 0.004877 0.004297 
+-0.002147 0.002209 0.003226 0.004799 
+-0.003969 0.000410 0.004675 -0.000105 
+-0.001887 0.003077 0.000888 0.000265 
+0.002214 0.003373 -0.004859 0.001010 
+0.003402 -0.000549 -0.002576 -0.001615 
+-0.000229 -0.001616 -0.000849 -0.004226 
+-0.004191 0.000271 0.003968 -0.001497