Phase-agent wrapper that opens the pull request after implementation completes (CTL-449 Initiative 1 Phase 3). Delegates to /catalyst-dev:create-pr (which already auto-runs describe-pr and transitions Linear to inReview), then writes the PR number + URL into the phase signal file so the downstream phase-monitor-merge agent can read it without re-querying GitHub. Dispatched as a claude --bg job by phase-agent-dispatch, which invokes it via slash command — hence user-invocable: true.
$npx -y skills add coalesce-labs/catalyst --skill phase-prInstalls into the current project.
Run `npx skills use "https://github.com/coalesce-labs/catalyst" --skill "coalesce-labs/catalyst/phase-pr"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/coalesce-labs/catalyst" that are relevant to the current task. Run `npx skills add "https://github.com/coalesce-labs/catalyst"` and select the relevant skills, then follow their instructions.