Init success output doesn't prove setup worked

[sentry-junior]

After sentry init completes, the terminal shows a static install summary (SDK package commands, project settings URL, docs link, enabled features). That leaves users unsure which project was created and whether anything actually reached Sentry.

Observed end state on Next.js App Router (@sentry/nextjs):

• "Sentry SDK installed successfully"
• platform, directory, and install commands
• Project URL pointing at project settings (e.g. …/settings/projects/<slug>/)
• Docs URL
• Features listed as set up (Error Monitoring, Session Replay, Tracing, Logging)

Gaps reported after that screen:

• Project outcome is easy to miss or hard to trust from the settings URL alone
• No test/sample error
• No CLI follow-through showing events or logs arriving
• No signal that data was sent successfully

Related: #1379 (finish with a clear summary of what was configured)

Reported by Dhrumil Parekh.

Requested by Dhrumil Parekh.

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View Junior Session [Sentry]

[sentry-junior]

Reporter clarification on the intended post-setup proof:

The gap is not only a missing sample/test error. After selecting tracing, logs, session replay, etc., with the app already running locally, sentry init ended on a static success summary and did not try to fetch live data for the enabled products or confirm those signals were actually arriving.

Desired signal after setup:

• CLI attempts to pull recent data for the features that were just configured (e.g. traces, logs, replays)
• Clear pass/fail that setup is working end-to-end against the running app
• Not only package install + project/settings links

This is distinct from injecting a permanent test page into app code.