fix(esopull): correct init layout and pre-streaming semantics (v0.5.1)

EsoPull curved boundaries and wall BCs now use consistent backing-layout
reads; InitEsoPull writes equilibrium in t=0 EsoPull layout. Cache N_OBJS
after compile and atomic config header writes to avoid parallel races.
Adds config screening tools, flume configs, and FP16S/EsoPull diagnosis doc.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursorignore

@@ -1,7 +1,7 @@
 # Cursor indexing / context — keep noise out of agent view
 # (Independent of .gitignore; ref/legacy are huge or obsolete.)
 
-ref/
+# ref/
 legacy/
 output/*.pdf
 **/*.ptx