fix(compiler): correct CIE semantics and diagnostic locations

Use standard WHILE headers and default-public class fields, resolve
pseudocode identifiers without case sensitivity, and check signed i64
literal boundaries before conversion. Preserve source locations across
recursive emission and function diagnostics.

Add 22 regression cases and update compiler examples and documentation.
Validated all 69 CTest entries with the original Linux Actions seed and
verified the release package's embedded, native and IR output paths.

1 files changed, 27 insertions, 0 deletions

diff --git a/include/cps/Identifier.h b/include/cps/Identifier.h
new file mode 100644
index 0000000..c35f636
--- /dev/null
+++ b/include/cps/Identifier.h
@@ -0,0 +1,27 @@
+#pragma once
+#include <algorithm>
+#include <map>
+#include <set>
+#include <string>
+
+namespace cps {
+
+inline unsigned char foldIdentifier(unsigned char C) {
+    return C >= 'A' && C <= 'Z' ? C + ('a' - 'A') : C;
+}
+
+struct IdentifierLess {
+    bool operator()(const std::string &A, const std::string &B) const {
+        return std::lexicographical_compare(A.begin(), A.end(), B.begin(), B.end(),
+            [](unsigned char L, unsigned char R) { return foldIdentifier(L) < foldIdentifier(R); });
+    }
+};
+
+inline bool sameIdentifier(const std::string &A, const std::string &B) {
+    return !IdentifierLess{}(A, B) && !IdentifierLess{}(B, A);
+}
+
+template<class T> using IdentifierMap = std::map<std::string, T, IdentifierLess>;
+using IdentifierSet = std::set<std::string, IdentifierLess>;
+
+} // namespace cps