feat(lanes): add ccam lanes proof-link CLI (C)

bin/ccam.js

@@ -2074,6 +2074,20 @@ async function cmdFeatureActivate(args) {
 }
 
 /** `ccam feature show <slug> [<id>] [--cwd path]` — one feature's saved pipeline. */
+/** `ccam lanes proof-link [<id>] [--cwd path]` — converge the clone-root
+ *  `proof/` onto `.playwright-mcp/proof` (idempotent). Never run automatically
+ *  by anything else in this codebase; a session or hook calls it explicitly. */
+async function cmdLanesProofLink(args) {
+  const resolved = await resolveLaneArg(args);
+  if (!resolved) return;
+  const { linked } = await post(`/api/lanes/${resolved.laneId}/proof-link`);
+  console.log(
+    linked
+      ? `${c.green("✔")} linked proof/ -> .playwright-mcp/proof`
+      : "proof/ already linked, nothing to do"
+  );
+}
+
 async function cmdFeatureShow(args) {
   const slug = args.find((arg) => !arg.startsWith("--"));
   if (!slug) {
@@ -2250,6 +2264,11 @@ const COMMAND_GROUPS = [
       ["lanes runtime", "[<id>]", "Slot, ports, service health and the last boot error"],
       ["lanes logs", "[<id>] <svc> [--tail N]", "Tail one of the lane's hook or service logs"],
       ["lanes hook", "[<id>] <name> [args…]", "Run a profile hook (ci-gate, e2e, migrate, …)"],
+      [
+        "lanes proof-link",
+        "[<id>]",
+        "Converge clone-root proof/ onto .playwright-mcp/proof (idempotent, never automatic)",
+      ],
       [
         "lock status|acquire|release",
         "[<name>] [--holder X] [--timeout N]",
@@ -3067,6 +3086,7 @@ async function runCommand(argv) {
       if (["up", "down", "runtime", "logs", "hook"].includes(rest[0])) {
         return cmdLanesRuntime(rest[0], rest.slice(1));
       }
+      if (rest[0] === "proof-link") return cmdLanesProofLink(rest.slice(1));
       return cmdLanes();
     case "lock": {
       const sub = rest[0];