chore: uv.sync and poetry.lock checks in SKILL.md

[ruaridhw]

Both poetry and uv use pyproject.toml

What problem are you trying to solve?

When using uv the environment doesn't get setup automatically.

What does this PR change?

Correctly search for uv vs poetry

Is this change appropriate for the core library?

Yes

What alternatives did you consider?

Nil

Does this PR contain multiple unrelated changes?

No

Existing PRs

• I have reviewed all open AND closed PRs for duplicates or prior art
• Related PRs:

none found other than this one closed

Environment tested

Harness (e.g. Claude Code, Cursor)	Harness version	Model	Model version/ID

Evaluation

• What was the initial prompt you (or your human partner) used to start
  the session that led to this change?
• How many eval sessions did you run AFTER making the change?
• How did outcomes change compared to before the change?

TBC

Rigor

• If this is a skills change: I used superpowers:writing-skills and
  completed adversarial pressure testing (paste results below)
• This change was tested adversarially, not just on the happy path
• I did not modify carefully-tuned content (Red Flags table,
  rationalizations, "human partner" language) without extensive evals
  showing the change is an improvement

Human review

• A human has reviewed the COMPLETE proposed diff before submission