Take Probe

Observed side of a session probe: this session is the test body, the fixture is the whole task. A fixture carries its own constraints — this skill adds none.

Steps

1. Resolve the reference (checkout-relative dir) against the session root; read <ref>/probe.md. Missing → report it in the failure shape check.sh prints, and stop. Done when the fixture text is loaded.
2. Follow probe.md verbatim, constraints included. Done when the fixture's own completion condition is met.
3. End with the report the fixture asks for as the last message.
4. Run check.sh beside this file.

Guardrails are added here only with a probe run that showed the need. The evidence lives in the commit that adds the rule and on its ticket, never in this file — skills are public, and carry no session ids or run narratives. git log on the rule reaches its evidence.