perf(cdp): compact protocol metadata at build time

Parse the vendored schema with serde_json::Value and serialize compact JSON
in build.rs. Embed the generated bytes without request-time processing.
Verify the embedded protocol matches the complete vendored schema.

Validation on the unchanged final source tree: cargo fmt --all;
cargo clippy --workspace --all-targets --all-features -- -D warnings;
cargo nextest run --no-fail-fast (20,505 passed, 18 existing skips).

moli-protocol-cdp/Cargo.toml

@@ -10,5 +10,8 @@ moli-time = { path = "../moli-time" }
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.145"
 
+[build-dependencies]
+serde_json = "1.0.145"
+
 [lints]
 workspace = true

moli-protocol-cdp/build.rs

@@ -0,0 +1,14 @@
+use std::{env, fs, path::PathBuf};
+
+const PROTOCOL_SOURCE: &str = "../vendor/v8-152.2.0/v8/include/js_protocol-1.3.json";
+
+fn main() {
+    println!("cargo:rerun-if-changed={PROTOCOL_SOURCE}");
+    let source = fs::read(PROTOCOL_SOURCE).expect("read vendored CDP protocol metadata");
+    let protocol: serde_json::Value =
+        serde_json::from_slice(&source).expect("parse vendored CDP protocol metadata");
+    let compact = serde_json::to_vec(&protocol).expect("serialize compact CDP protocol metadata");
+    let destination = PathBuf::from(env::var_os("OUT_DIR").expect("Cargo build output directory"))
+        .join("cdp-protocol.json");
+    fs::write(destination, compact).expect("write compact CDP protocol metadata");
+}

moli-protocol-cdp/src/metadata.rs

@@ -1,2 +1 @@
-pub const CDP_PROTOCOL_JSON: &str =
-    include_str!("../../vendor/v8-152.2.0/v8/include/js_protocol-1.3.json");
+pub const CDP_PROTOCOL_JSON: &str = include_str!(concat!(env!("OUT_DIR"), "/cdp-protocol.json"));

moli-protocol-cdp/tests/protocol_metadata.rs

@@ -0,0 +1,11 @@
+use moli_protocol_cdp::CDP_PROTOCOL_JSON;
+use serde_json::Value;
+
+#[test]
+fn embedded_protocol_preserves_the_complete_vendored_schema() {
+    let source = include_str!("../../vendor/v8-152.2.0/v8/include/js_protocol-1.3.json");
+    let original: Value = serde_json::from_str(source).expect("valid vendored CDP protocol");
+    let embedded: Value =
+        serde_json::from_str(CDP_PROTOCOL_JSON).expect("valid embedded CDP protocol");
+    assert_eq!(embedded, original);
+}