Rewrite jwt-pitbul and boko-framework with modern Bux constructs

- jwt-pitbul: algebraic enums, Array<String>, methods on JwtAlg,
  string interpolation, structured Result/Option error handling.
- boko-framework: StringMap<String> for headers/query/path params,
  Request/Response methods, StringBuilder, for loops, algebraic enums.
- Update READMEs and bump versions to 0.2.0.

apps/jwt-pitbul/README.md

@@ -4,12 +4,14 @@
 
 A standalone command-line utility for working with JSON Web Tokens (RFC 7519). Built on `Std::Crypto`, backed by OpenSSL.
 
+This version (0.2.0) is rewritten with modern Bux: algebraic enums, generic `Array<String>`, methods on `JwtAlg`, string interpolation, `for` loops, and structured `Result`/`Option`-style error handling.
+
 ## Quick Start
 
 ```bash
 cd apps/jwt-pitbul
 ../../buxc build
-./jwt-pitbul
+./build/jwt-pitbul
 ```
 
 ## Commands