fix(qa): reject malformed kitchen-sink CPU samples

scripts/e2e/kitchen-sink-rpc-walk.mjs

@@ -1740,7 +1740,7 @@ function parsePosixProcessRows(stdout) {
       const processId = Number.parseInt(pidRaw, 10);
       const parentProcessId = Number.parseInt(ppidRaw, 10);
       const rssKb = Number.parseInt(rssKbRaw, 10);
-      const cpuPercent = Number.parseFloat(cpuRaw);
+      const cpuPercent = parsePosixCpuPercent(cpuRaw);
       if (
         !Number.isInteger(processId) ||
         !Number.isInteger(parentProcessId) ||
@@ -1752,13 +1752,22 @@ function parsePosixProcessRows(stdout) {
         processId,
         parentProcessId,
         rssKb,
-        cpuPercent: Number.isFinite(cpuPercent) ? cpuPercent : null,
+        cpuPercent,
         command: command ?? "",
       };
     })
     .filter(Boolean);
 }
 
+function parsePosixCpuPercent(raw) {
+  const text = String(raw ?? "").trim();
+  if (!/^(?:0|[1-9]\d*)(?:\.\d+)?$/u.test(text)) {
+    return null;
+  }
+  const parsed = Number(text);
+  return Number.isFinite(parsed) ? parsed : null;
+}
+
 function collectPosixProcessTree(rows, rootPid) {
   const byParent = new Map();
   for (const row of rows) {

test/scripts/kitchen-sink-rpc-walk.test.ts

@@ -1412,6 +1412,23 @@ describe("kitchen-sink RPC process sampling", () => {
     });
   });
 
+  it("does not truncate malformed POSIX CPU samples", async () => {
+    const sample = await sampleProcess(4321, {
+      platform: "linux",
+      runCommand: async () => ({
+        stdout: " 4321     1  262144  12.5.6 node dist/index.js gateway --port 19080",
+        stderr: "",
+      }),
+    });
+
+    expect(sample).toEqual({
+      aggregateRssMiB: 256,
+      cpuPercent: null,
+      processId: 4321,
+      rssMiB: 256,
+    });
+  });
+
   it("samples the POSIX gateway child instead of the pnpm launcher", async () => {
     const sample = await sampleProcess(4321, {
       platform: "linux",