Restore Rust core at repository root

Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

.agents/resume

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
 set -euo pipefail
-command -v npm >/dev/null
+
+export PATH="$HOME/.local/bin:$HOME/.cargo/bin:$PATH"
+for command in npm cargo wasm-pack; do command -v "$command" >/dev/null; done
 amp orb services ensure

.agents/setup

@@ -1,4 +1,14 @@
 #!/usr/bin/env bash
 set -euo pipefail
+
+export PATH="$HOME/.local/bin:$HOME/.cargo/bin:$PATH"
+if ! command -v rustup >/dev/null; then
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
+fi
+toolchain="$(sed -n 's/^channel = "\([^"]*\)"/\1/p' rust-toolchain.toml)"
+rustup toolchain install "$toolchain" --profile minimal --component rust-src,rustfmt --target wasm32-unknown-unknown
+if ! command -v wasm-pack >/dev/null; then
+    cargo install wasm-pack --version 0.15.0 --locked
+fi
 npm ci
 amp orb services ensure