axon-frontend 0.6.0

AXON compiler frontend — lexer, parser, AST, epistemic type system, type checker, IR generator, compile-time checker. Zero runtime dependencies. v0.6.0 adds IRBreak / IRContinue for Fase 19.e ForIn break/continue + Parser loop_depth scope check. v0.5.0 shipped IRReturn.value_kind for Fase 18.d return runtime wiring. v0.4.0 closed Fase 17 (let runtime). v0.3.0 closed Fase 14 (lossless lexing). v0.2.0 added Fase 13 typed channels.