fix(db): keep router_profile through the legacy lanes rebuild

The (cwd, tool) rebuild lists its columns by hand and omitted
router_profile, which its probe adds earlier in the same start — a legacy
DB lost the column (and every lane's router) until the next restart.

server/__tests__/lanes-cwd-unique-rebuild.test.js

@@ -85,6 +85,17 @@ describe("legacy lanes_new rebuild (pre-tool, single-column cwd UNIQUE DB)", ()
     assert.equal(row.tool, "claude");
   });
 
+  it("keeps every column added before the rebuild, router_profile included", () => {
+    const { db } = require("../db");
+    const cols = db
+      .prepare("PRAGMA table_info(lanes)")
+      .all()
+      .map((c) => c.name);
+    for (const name of ["router_profile", "needs_action_session"]) {
+      assert.ok(cols.includes(name), `expected ${name} to survive the rebuild`);
+    }
+  });
+
   it("recreates idx_lanes_session and idx_lanes_slot", () => {
     const { db } = require("../db");
     for (const name of ["idx_lanes_session", "idx_lanes_slot"]) {