feat(lanes): add POST /api/lanes/gc route (F4)

server/routes/lanes.js

@@ -46,6 +46,7 @@ const {
   resetLaneData,
   removeLaneData,
 } = require("../lib/lane-runtime");
+const { reapOrphanMcp, capOversizedLogs } = require("../lib/lane-gc");
 
 const router = Router();
 const MAX_WORKTREE_DIRECTORY_ATTEMPTS = 50;
@@ -174,6 +175,23 @@ router.post("/ensure", sameOriginGuard, (req, res) => {
   }
 });
 
+/**
+ * Machine-wide housekeeping — not scoped to one lane. Reaps orphaned
+ * Playwright MCP processes and caps oversized hook logs across every lane
+ * on this machine. See server/lib/lane-gc.js for what "orphaned" and
+ * "oversized" mean.
+ */
+router.post("/gc", sameOriginGuard, (req, res) => {
+  const dryRun = req.body?.dryRun === true;
+  try {
+    const reaped = reapOrphanMcp({ dryRun });
+    const capped = capOversizedLogs({ dryRun });
+    res.json({ reaped, capped });
+  } catch (err) {
+    res.status(500).json({ error: { code: err.code || "ERUNTIME", message: err.message } });
+  }
+});
+
 router.get("/:id", (req, res) => {
   const lane = lanesLib.getLane(req.params.id);
   if (!lane) return res.status(404).json({ error: { code: "ENOLANE", message: "lane not found" } });