Continued and hardened game hosting reliability.

Updated:
- [tools/Workspace Manager/main.js](C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\tools\Workspace Manager\main.js)
  - Added a strict block when shared host context cannot be written.
  - Now refuses game mount with clear status:
    - `Unable to mount game: workspace host context storage is unavailable in this browser session.`
  - Requires `hostContextId` on every hosted game iframe URL (removed nullable fallback branch).

Validation/report:
- [docs/dev/reports/samples2tools_batch_48_validation.txt](C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\docs\dev\reports\samples2tools_batch_48_validation.txt) (`PASS`)
- [docs/dev/reports/samples2tools_batch_48_summary.txt](C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\docs\dev\reports\samples2tools_batch_48_summary.txt)

Commit comment:
`Harden Workspace Manager hosted-game flow by blocking mounts when shared host context storage is unavailable, enforcing hostContextId on all game iframe launches, and removing nullable hostContext fallback (batch-48 PASS).`

Author: DavidQ

docs/dev/reports/samples2tools_batch_48_summary.txt

@@ -0,0 +1,11 @@
+Samples2Tools batch 48 summary
+Generated: 2026-04-24T22:49:16.610Z
+Purpose: harden Workspace Manager game mount flow for sessions where host context storage is unavailable.
+
+Completed this batch:
+- Added explicit mount block + status message when host context cannot be written
+- Required hostContextId on every hosted game iframe mount URL
+- Removed nullable hostContextId fallback branch
+
+Primary validation artifact:
+- docs/dev/reports/samples2tools_batch_48_validation.txt (PASS)

docs/dev/reports/samples2tools_batch_48_validation.txt

@@ -0,0 +1,11 @@
+Samples2Tools batch 48 validation
+Generated: 2026-04-24T22:49:16.610Z
+Scope: prevent invalid hosted-game mount when shared host context cannot be persisted.
+
+- [PASS] Game mount blocks when host context storage is unavailable :: tools/Workspace Manager/main.js
+- [PASS] Game mount always appends hostContextId when mounting :: tools/Workspace Manager/main.js
+- [PASS] No legacy nullable hostContextId fallback branch remains :: tools/Workspace Manager/main.js
+
+Checks: 3
+Failures: 0
+Result: PASS

tools/Workspace Manager/main.js

@@ -223,6 +223,11 @@ function mountGameFrame(gameEntry) {
       }
     }
   });
+  if (!hostContext?.contextId) {
+    writeStatus("Unable to mount game: workspace host context storage is unavailable in this browser session.");
+    setCurrentLabel("No game mounted.");
+    return false;
+  }
 
   const frame = document.createElement("iframe");
   frame.setAttribute("data-game-host-frame", gameEntry.id);
@@ -232,12 +237,8 @@ function mountGameFrame(gameEntry) {
   gameUrl.searchParams.set("hosted", "1");
   gameUrl.searchParams.set("hostToolId", "workspace-manager");
   gameUrl.searchParams.set("hostGameId", gameEntry.id);
-  if (hostContext?.contextId) {
-    currentGameHostContextId = hostContext.contextId;
-    gameUrl.searchParams.set("hostContextId", hostContext.contextId);
-  } else {
-    currentGameHostContextId = "";
-  }
+  currentGameHostContextId = hostContext.contextId;
+  gameUrl.searchParams.set("hostContextId", hostContext.contextId);
   frame.src = gameUrl.toString();
   refs.mountContainer.replaceChildren(frame);
   currentGameFrame = frame;