[feature-runner] PR creation and worktree cleanup

[orioltf]

This was generated by AI during triage.

Parent

docs/issues/feature-runner/PRD.md

What to build

Extend the skill so that when all issues in a feature are resolved, it opens a pull request targeting develop using the gh CLI. The PR title is derived from the feature slug and the PRD's title frontmatter field. The PR body references the feature PRD and lists all resolved issues. After the PR is opened successfully, the worktree is removed.

Blocked on failure handling (02) so the runner never reaches PR creation when an issue has failed.

Acceptance criteria

• When all issues in the feature are resolved, gh pr create is called targeting develop
• PR title is derived from the feature slug and the PRD's title frontmatter field
• PR body includes a reference to docs/issues/<slug>/PRD.md and a list of all resolved issues
• The worktree is removed after the PR is opened successfully
• No PR is opened if the runner stopped due to a /tdd failure (failure handling from 02 prevents this)

Blocked by

#81

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PRD: docs/issues/feature-runner/PRD.md
Migrated from: docs/issues/feature-runner/03-pr-creation.md (source removed after migration)
Touched by PRs: #25, #32