fix(ooniprobe): introduce the onboarding quiz as a comprehension check

[ChandlerHardy]

Checklist

• I have read the contribution guidelines
• reference issue for this pull request: [Feature?] [Cli] Confusing wording in start up quiz probe#2865
• related ooni/probe issue: [Feature?] [Cli] Confusing wording in start up quiz probe#2865

Description

The onboarding Pop Quiz currently presents bare statements with true/false options and no framing. As reported in ooni/probe#2865, this reads ambiguously: the survey prompt renders a ? in front of what is actually a statement, and it's unclear whether the user is being asked for consent, for facts, or for preferences.

In that thread @hellais ruled out consent-style wording (OONI can't act on a refusal — the goal is informing the user) and proposed framing the quiz explicitly as a comprehension check:

To confirm your understanding of the OONI Probe functionality, can you answer the following statement with true/false

This PR implements exactly that: one introductory paragraph before the quiz, no flow or behavior changes.

Before:

┏━━━━━━━━━━━━━━━━┓
┃ Pop Quiz!      ┃
┗━━━━━━━━━━━━━━━━┛
? Anyone monitoring my internet activity may be able to see that I am running OONI Probe. (true/false)

After:

┏━━━━━━━━━━━━━━━━┓
┃ Pop Quiz!      ┃
┗━━━━━━━━━━━━━━━━┛
To confirm your understanding of how OONI Probe works, mark each of the
following statements as true or false.

? Anyone monitoring my internet activity may be able to see that I am running OONI Probe. (true/false)

The reporter's other point (being re-asked about publishing after opting out at install time) is a config-flow question @hellais addressed separately in the thread; deliberately out of scope here.

Verified with gofmt + go vet and package compilation. Happy to adjust the copy however the team prefers.

🤖 Generated with Claude Code

https://claude.ai/code/session_011x7Jp2AKWfdvv9YAU5bW4b