feat(e2e): add window.__FERROUS_DEBUG__ bridge to /play for automation

play.html now loads solitaire_wasm.js alongside the Bevy canvas and
exposes the same window.__FERROUS_DEBUG__ object as /play-classic.
The bridge runs an independent SolitaireGame (WASM logic layer) seeded
from ?seed= / ?draw3= URL params; Bevy renders the visual game in
parallel without coupling.

Methods exposed: seed, state, legalMoves, moveHistory, snapshot,
applyLegalMove, applyMove, draw, undo, serialize, fromSaved, newGame,
failureReport, replayPayload, runAutoplay — matching the /play-classic
contract so the shared Playwright harness targets either route without
modification.

cycle_metrics.js: add --route play-classic|play flag (default
play-classic). Routes to /${route}?seed=N. The resume-overlay clear
step is skipped for /play since the Bevy build uses localStorage-backed
WasmStorage, not a #resume-overlay element.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_server/e2e/scripts/cycle_metrics.js

@@ -103,6 +103,9 @@ async function main() {
     const policyArg = readArg("--policy", "loop_aware");
     const policy = policyArg === "baseline" ? "baseline" : "loop_aware";
     const outPath = readArg("--out", "/tmp/playwright-cycle-metrics.json");
+    // --route play-classic (default) or --route play
+    const routeArg = readArg("--route", "play-classic");
+    const route = routeArg === "play" ? "play" : "play-classic";
     const maxCycleRateAll = parseOptionalNumber("--max-cycle-rate-all");
     const maxCycleRateDraw1 = parseOptionalNumber("--max-cycle-rate-draw1");
     const maxCycleRateDraw3 = parseOptionalNumber("--max-cycle-rate-draw3");
@@ -155,17 +158,19 @@ async function main() {
                 }
             });
 
-            await page.goto(`${baseUrl}/play-classic?seed=${seed}${suffix}`, {
+            await page.goto(`${baseUrl}/${route}?seed=${seed}${suffix}`, {
                 waitUntil: "domcontentloaded",
             });
 
-            const resumeVisible = await page
-                .locator("#resume-overlay:not(.hidden)")
-                .isVisible()
-                .catch(() => false);
-            if (resumeVisible) {
-                await page.evaluate(() => localStorage.removeItem("fs_game_save"));
-                await page.reload({ waitUntil: "domcontentloaded" });
+            if (route === "play-classic") {
+                const resumeVisible = await page
+                    .locator("#resume-overlay:not(.hidden)")
+                    .isVisible()
+                    .catch(() => false);
+                if (resumeVisible) {
+                    await page.evaluate(() => localStorage.removeItem("fs_game_save"));
+                    await page.reload({ waitUntil: "domcontentloaded" });
+                }
             }
 
             await page.waitForFunction(