After the runtime starts, the packaged renderer was left on its file:// page and only had
?serverBaseUrl=… appended. But the dashboard client issues RELATIVE /api requests, so on a
file:// origin they resolve to file:///api/… and fail ("Can't reach the Fusion backend /
Failed to fetch"); the embedded server also sends no CORS header, so a cross-origin fetch
would be blocked as well. (The server itself is fine — verified it serves both /api/health
and the client HTML at /.)
Fix: once the runtime is running, navigate the window to the runtime's OWN origin
(http://127.0.0.1:<port>/), which the embedded server serves — making /api same-origin.
This mirrors how remote mode already navigates to its server URL. The gate now treats "page
served over http(s)" as the ready signal (protocol check) instead of a serverBaseUrl URL
param; that also supersedes the previous cached-context handoff check (04fd91f6) and keeps
the reload loop closed, since bootstrapShellHostContext() strips shell query params at load.
Regression tests: navigates to the runtime origin exactly once from file://; renders the app
without navigating when already served over http; starts the runtime first when it isn't
running, then navigates.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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