MVP: AILang-Sprache mit JSON-AST, Typchecker, LLVM-IR-Backend

Erste lauffähige Iteration. examples/sum.ail.json wird zu nativem Binary
kompiliert und druckt 55 (Summe 1..10) als End-to-End-Test.

Architektur:
- ailang-core: hashbares JSON-AST + canonical-form + pretty-printer
- ailang-check: monomorpher HM-Subset + Effekt-Set-Tracking
- ailang-codegen: LLVM-IR-Text-Emitter (kein libllvm-link)
- ail: CLI mit check/manifest/render/describe/emit-ir/build/builtins

Designentscheidungen sind in docs/DESIGN.md dokumentiert; der Verlauf
in docs/JOURNAL.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,32 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/ailang-core",
+    "crates/ailang-check",
+    "crates/ailang-codegen",
+    "crates/ail",
+]
+
+[workspace.package]
+version = "0.0.1"
+edition = "2021"
+license = "MIT"
+repository = "local"
+rust-version = "1.80"
+
+[workspace.dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1", features = ["preserve_order"] }
+blake3 = "1"
+anyhow = "1"
+thiserror = "1"
+clap = { version = "4", features = ["derive"] }
+indexmap = { version = "2", features = ["serde"] }
+
+ailang-core = { path = "crates/ailang-core" }
+ailang-check = { path = "crates/ailang-check" }
+ailang-codegen = { path = "crates/ailang-codegen" }
+
+[profile.release]
+lto = "thin"
+codegen-units = 1