* ci: add issue/PR description completeness checks (#1958)
Two github-script workflows that validate description structure on
issue/PR open/edit/reopen, for submissions that bypass the browser
template (API, gh CLI, agent bulk PRs).
- PR check: Summary, Linked Issue, Type of Change, duplicate-search
box, How to Test.
- Issue check: body length + per-label bug/enhancement fields, plus a
bug+enhancement conflict guard.
- Pass deletes any prior bot comment and applies `ready for review`;
fail posts an in-place comment, fails the check, and applies
`needs work` (PRs) / `needs more info` (issues).
- References existing labels only — never creates or recolours repo
labels (checks existence first, warns and skips if absent).
- Safe pull_request_target: checkout pinned to the base ref, sparse
`.github/scripts` only; PR head never checked out.
Closes#1958
Co-authored-by: Povilas Kirna <povilas.kirna@pebble.net>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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