Proposal: shorten define-goal and playwright descriptions

Proposal

Shorten two curated skill descriptions so their routing capability and boundary remain clear in compact skill catalogs.

• define-goal: Define measurable goals; do not manage execution state.
• playwright: Use Playwright CLI for explicit terminal browser tasks.

Both descriptions are within 57 characters, end with a period, and leave their skill bodies unchanged.

Prepared change

The exact commit is available at: https://github.com/vladimirtsk/openai-skills/commit/84bb10e

Branch comparison: https://github.com/openai/skills/compare/main...vladimirtsk:openai-skills:docs/shorten-skill-descriptions

I attempted to open a pull request, but both GraphQL PR creation and the REST pull-request endpoint were unavailable for this repository. If there is a preferred contribution path, I can resubmit through it.