Prune stale docs and update .hermes content

Delete a large set of outdated documentation (many files under docs/ and .hermes/plans/, including audits, design, prd, technical, planning, assets, and todos). Update and consolidate .hermes content: refresh shared-memory pages (decision-log, development-workflow, document-map, pitfalls, project-overview, team-conventions) and several skills/references under .hermes/skills. Also modify AGENTS.md, README.md, UI_CODING_STANDARD.md, docs/README.md and .encoding-check-ignore. Purpose: clean up stale planning/audit material and keep current hermes documentation and related top-level docs in sync.

src/components/platform-entry/PlatformEntryFlowShellImpl.tsx

@@ -709,6 +709,32 @@ function hasMatch3DRuntimeAsset(
   return hasMatch3DGeneratedImageAsset(assets);
 }
 
+function hasMatch3DRuntimeBackgroundAsset(
+  profile: Pick<
+    Match3DWorkSummary,
+    | 'backgroundImageSrc'
+    | 'backgroundImageObjectKey'
+    | 'generatedBackgroundAsset'
+    | 'generatedItemAssets'
+  >,
+) {
+  return Boolean(
+    profile.backgroundImageSrc?.trim() ||
+      profile.backgroundImageObjectKey?.trim() ||
+      profile.generatedBackgroundAsset?.imageSrc?.trim() ||
+      profile.generatedBackgroundAsset?.imageObjectKey?.trim() ||
+      profile.generatedBackgroundAsset?.containerImageSrc?.trim() ||
+      profile.generatedBackgroundAsset?.containerImageObjectKey?.trim() ||
+      profile.generatedItemAssets?.some(
+        (asset) =>
+          asset.backgroundAsset?.imageSrc?.trim() ||
+          asset.backgroundAsset?.imageObjectKey?.trim() ||
+          asset.backgroundAsset?.containerImageSrc?.trim() ||
+          asset.backgroundAsset?.containerImageObjectKey?.trim(),
+      ),
+  );
+}
+
 function resolveMatch3DRuntimeGeneratedItemAssets(
   run: Match3DRunSnapshot | null,
   profile: Match3DWorkProfile | null,
@@ -3773,6 +3799,7 @@ export function PlatformEntryFlowShellImpl({
         try {
           await preloadMatch3DGeneratedRuntimeAssets(
             runtimeProfile.generatedItemAssets,
+            runtimeProfile.generatedBackgroundAsset,
             { expireSeconds: 300 },
           );
           const { run } = await match3dRuntimeAdapter.startRun(
@@ -4880,6 +4907,7 @@ export function PlatformEntryFlowShellImpl({
           try {
             await preloadMatch3DGeneratedRuntimeAssets(
               runtimeProfile.generatedItemAssets,
+              runtimeProfile.generatedBackgroundAsset,
               { expireSeconds: 300 },
             );
             const { run } = await match3dRuntimeAdapter.startRun(
@@ -6557,7 +6585,10 @@ export function PlatformEntryFlowShellImpl({
 
       try {
         let runtimeProfile = profile;
-        if (!hasMatch3DRuntimeAsset(profile.generatedItemAssets)) {
+        if (
+          !hasMatch3DRuntimeAsset(profile.generatedItemAssets) ||
+          !hasMatch3DRuntimeBackgroundAsset(profile)
+        ) {
           try {
             const { item } = await getMatch3DWorkDetail(profile.profileId);
             runtimeProfile = {
@@ -6579,6 +6610,7 @@ export function PlatformEntryFlowShellImpl({
         };
         await preloadMatch3DGeneratedRuntimeAssets(
           runtimeProfile.generatedItemAssets,
+          runtimeProfile.generatedBackgroundAsset,
           { expireSeconds: 300 },
         );
         const runtimeOptions = {
@@ -9314,6 +9346,11 @@ export function PlatformEntryFlowShellImpl({
           isBusy={isMatch3DBusy}
           error={match3dError}
           embedded
+          hideBackButton
+          levelName={
+            activeMatch3DRuntimeProfile?.gameName?.trim() ||
+            activeEntry.worldName
+          }
           generatedItemAssets={resolveMatch3DRuntimeGeneratedItemAssets(
             match3dRun,
             activeMatch3DRuntimeProfile,