fix(self-driving): Copy fixes, enable error tracking and replay by default, rename "fleet" to "troop"

[sortafreel]

What was the problem

• The GitHub-connect prompt offered a second "re-link via settings" link. It wrapped across lines and could not be clicked or copied, and it duplicated what the main authorize link already does.
• The connected-tools question described Signals passively ("watch your other tools and pull their issues into the inbox"), which undersold what it actually does.
• Step 2 told the agent to read posthog-setup-report.md as if it always exists, but it is missing for projects set up a while ago, set up manually or via the snippet, or never set up with the wizard.
• Error tracking and session replay were only switched on when there was current evidence of use, so a project that has not started using them yet got nothing, even though an idle source costs nothing and teams tend to adopt them later.
• The GitHub Issues and Linear connectors carried "older server" fallback handling for a server we ship and control, so the case could never happen.
• The skill called the group of scouts a "fleet," but the UI now calls it a "troop."

What we changed

• Removed the re-link and integrations-settings text from the GitHub-connect prompt. The single authorize link already covers a fresh install, linking an existing install, and re-auth, and it stays alone on its own line so it stays clickable.
• Reworded the connected-tools question to active framing: watch your other tools and investigate and fix the problems they surface.
• Clarified that posthog-setup-report.md may be absent, and that its absence means no signal rather than nothing instrumented, so the agent falls through to the project profile and usage probes.
• Made error tracking and session replay lean toward enabling by default, even with no current signal. Existing evidence only raises confidence, and its absence is no longer a reason to skip.
• Removed the "older server" fallback text from the GitHub Issues and Linear connector steps, keeping only the real dormant-fallback paths.
• Renamed "fleet" to "troop" throughout the skill to match the UI.

[github-actions]

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