feat(lanes): add ccam lanes agents install CLI (E3)

bin/ccam.js

@@ -2155,6 +2155,25 @@ async function cmdLanesProofLink(args) {
   );
 }
 
+/** `ccam lanes agents install [<id>] [--cwd path]` — write the ship-feature-lane
+ *  agent templates (qc-local, senior-gate-reviewer) into <lane>/.claude/agents/,
+ *  git-excluded. Never run automatically; a session calls it explicitly. */
+async function cmdLanesAgentsInstall(args) {
+  const resolved = await resolveLaneArg(args);
+  if (!resolved) return;
+  const result = await post(
+    `/api/lanes/${resolved.laneId}/agents/install`,
+    {},
+    { allowError: true }
+  );
+  if (result.status) {
+    console.error(`✖ agents install → ${result.data?.error?.message || result.status}`);
+    process.exitCode = 1;
+    return;
+  }
+  console.log(`${c.green("✔")} installed: ${result.installed.join(", ")}`);
+}
+
 async function cmdFeatureShow(args) {
   const slug = args.find((arg) => !arg.startsWith("--"));
   if (!slug) {
@@ -2341,6 +2360,11 @@ const COMMAND_GROUPS = [
         "[<id>]",
         "Converge clone-root proof/ onto .playwright-mcp/proof (idempotent, never automatic)",
       ],
+      [
+        "lanes agents install",
+        "[<id>]",
+        "Write the ship-feature-lane agent templates (qc-local, senior-gate-reviewer) into <lane>/.claude/agents/, git-excluded",
+      ],
       [
         "lock status|acquire|release",
         "[<name>] [--holder X] [--timeout N]",
@@ -3159,6 +3183,9 @@ async function runCommand(argv) {
         return cmdLanesRuntime(rest[0], rest.slice(1));
       }
       if (rest[0] === "proof-link") return cmdLanesProofLink(rest.slice(1));
+      if (rest[0] === "agents" && rest[1] === "install") {
+        return cmdLanesAgentsInstall(rest.slice(2));
+      }
       return cmdLanes();
     case "lock": {
       const sub = rest[0];