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"]) {

server/db.js

@@ -645,6 +645,8 @@ try {
     db.exec(`
       PRAGMA foreign_keys = OFF;
       BEGIN;
+      -- Every column the probes ABOVE this block add must be listed here too,
+      -- or the rebuild silently drops it (router_profile once was).
       CREATE TABLE lanes_new (
         id INTEGER PRIMARY KEY AUTOINCREMENT,
         title TEXT NOT NULL DEFAULT '',
@@ -669,6 +671,7 @@ try {
         base_branch TEXT,
         slug TEXT,
         tool TEXT NOT NULL DEFAULT 'claude',
+        router_profile TEXT,
         detected_stage TEXT,
         detected_signal TEXT,
         detected_at TEXT,
@@ -679,7 +682,7 @@ try {
       INSERT INTO lanes_new SELECT
         id, title, cwd, branch, pipeline, session_id, run_id, stage, stage_since,
         status, gate_decision, ci_status, needs_action, links, stages, notes,
-        created_at, updated_at, kind, source_repo, base_branch, slug, tool,
+        created_at, updated_at, kind, source_repo, base_branch, slug, tool, router_profile,
         detected_stage, detected_signal, detected_at, slot, ports, active_feature_id
       FROM lanes;
       DROP TABLE lanes;