chore: delete PR template to inherit org default

AGENTS.md

@@ -149,10 +149,14 @@ are validated upstream, and this repo must not hand-edit them.
 `ci-status` is the single required check. It fails on a title that is not
 Conventional Commits (`build`, `chore`, `ci`, `docs`, `feat`, `fix`, `perf`,
 `refactor`, `revert`, `security`, `style`, `test`) and on a `do-not-merge`
-label. Every body opens with a closing keyword and issue (`Closes #<issue>`,
-`Fixes`, or `Resolves`, cross-repo as `Closes <owner>/<repo>#<issue>`) or with
-the literal `No related issue: <reason>`, then carries a non-empty
-`## Summary`, `## Fix`, `## Verification` and `## Related`. The linkage rule is
-advisory: a body missing the keyword or a section gets a comment and the
-`needs-issue-linkage` label, not a red check. Draft the body to
-`.github/PULL_REQUEST_TEMPLATE.md` before opening the pull request.
+label. Every body opens with a closing keyword and issue ("Closes #<issue>",
+"Fixes", or "Resolves", cross-repo as "Closes <owner>/<repo>#<issue>") or with
+the no-issue escape and its reason, "No related issue: <reason>". Write that
+opening line as plain text: the gate masks inline code spans before matching,
+so a backticked keyword or escape is invisible to it. The body then carries a
+non-empty `## Summary`, `## Fix`, `## Verification` and `## Related`. The
+linkage rule is advisory: a body missing the keyword or a section gets a
+comment and the `needs-issue-linkage` label, not a red check. Draft the body
+to that shape before opening the pull request: this repository carries no
+local template and inherits the org default from
+[`melodic-software/.github`](https://github.com/melodic-software/.github/blob/main/.github/PULL_REQUEST_TEMPLATE.md).