docs: clarify Lua nesting limit (180 guard vs ~200 parser cap)

Unisay · Unisay · commit ceeca30a92ab · 2026-06-25T10:18:56.000+02:00
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
@@ -251,7 +251,8 @@ which collapses `Array Unit` to an empty table.
 **Lua 5.1 limits** to keep in mind:
 - Max ~200 local variables per function
 - Max ~60 upvalues per closure
-- Parser nesting depth limit ~200 levels (`NestingTooDeep` error)
+- Parser nesting depth limit ~200 levels in Lua; `pslua` rejects
+  conservatively at depth 180 with the `NestingTooDeep` error
 
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