Fix invalid JSON in step-catalog-en.json (missing comma breaks fmlint)

[skerkvli]

The Go to Layout step's Layout param (added in the GoToLayoutFix change)
is missing a comma after its "notes" value, so step-catalog-en.json is not
valid JSON.

Because fmlint loads this catalog on every XML lint (catalog.has_step ->
json.load), the whole linter fails with:

json.decoder.JSONDecodeError: Expecting ',' delimiter (line ~2958)

Fix: add the missing comma after the "notes" line. Verified the file parses
and python3 -m agent.fmlint runs again afterward.

[agentic-fm]

Thank you for catching this, @skerkvli — a single missing comma had turned step-catalog-en.json into invalid JSON, and since fmlint json.loads the catalog on every XML lint, the whole linter was throwing JSONDecodeError on main. Nice, precise diagnosis.

Verified end-to-end: the catalog at ref=main failed json.load at line 2958, and your one-character fix is exactly right — the file parses cleanly with it applied. Approving.

Heads-up for transparency: the same fix also just landed on main via our internal publish, so you may see it as already present — but your catch was real and independent, and we're merging your PR so it's properly credited to you. 🙏