fix(bootstrap): simple enum codegen, crypto parser compatibility, import ordering

- Fix bootstrap sema to type simple enum variants as the enum itself
  (not _Tag), and .tag access returns the enum type.
- Fix hir_lower to lower simple enum .tag as no-op and Enum{tag:X}
  init as X directly.
- Fix sema collectGlobals to register imports AFTER real declarations,
  preventing duplicate-symbol errors when stdlib files import symbols
  defined in later files (e.g. jwt.bux importing rsa.bux).
- Rewrite lib/crypto/*.bux as single-line to work around bootstrap
  parser limitations with multi-line function calls.
- Rename 'pub' -> 'pubBuf' in ed25519.bux and jwt-pitbul/Main.bux
  to avoid reserved keyword collision.
- Remove algTag:int workaround from jwt-pitbul/Main.bux; enum
  comparisons now type-check without manual casts.
- Update .gitignore to exclude _test_*/ and backup files.
- Delete accidentally-committed _test_array/ directory.

.gitignore

@@ -22,3 +22,12 @@ build/
 _test_tmp_pkg/
 test_pkg/
 examples_pkg/
+
+# Temporary test directories
+_test_*/
+
+# Backup files
+*.bak
+
+# Log files
+*.log