Phase 25.1a: selfhost builder hotfix (fn rename, docs)

Cargo.toml

@@ -63,7 +63,12 @@ name = "nyash_rust"
 path = "src/lib.rs"
 crate-type = ["cdylib", "rlib"]
 
-# Main CLI binary - always available
+# Bin layout (Stage0/Stage1)
+# - Stage0: Rust bootstrap CLI (`nyash`) — OS entry, VM/LLVM core, minimal runner.
+# - Stage1: Hakorune selfhost binary (`hakorune-selfhost`) is built via tools/selfhost/build_stage1.sh
+#           and lives under target/selfhost/, not as a Cargo [[bin]] (Phase 25.1 design).
+
+# Main CLI binary - always available (Stage0 bootstrap)
 [[bin]]
 name = "nyash"
 path = "src/main.rs"
@@ -272,6 +277,11 @@ debug = true
 [profile.release.package."nyash-net-plugin"]
 opt-level = "z"
 strip = true
+
+[[bin]]
+name = "hakorune-rust"
+path = "src/main.rs"
+
 [[bin]]
 name = "hakorune"
 path = "src/main.rs"