AXON compiler frontend — lexer, parser, AST, epistemic type system, type checker, IR generator, compile-time checker. Zero runtime dependencies. v0.9.0 ships Fase 30 HTTP transport surface: new `transport: {json,sse,ndjson}` + `keepalive: {5s,15s,30s,60s}` axonendpoint fields (parser + AST + drift-gated cross-stack with Python). v0.8.0 Fase 28 adopter diagnostic robustness (parse_with_recovery → ParseResult, SourceSnippet, smart_suggest). v0.7.0 Fase 23 algebraic effects runtime IR. v0.6.0 IRBreak/IRContinue. v0.5.0 IRReturn.value_kind. v0.4.0 closed Fase 17 (let). v0.3.0 closed Fase 14 (lossless lexing). v0.2.0 Fase 13 typed channels.