fix: align linked-issue PR guidance

Keep commitperclip guidance in contributor-facing PR docs and bot copy instead of root AGENTS.md or bundled product skills.

Align the accepted examples with the current linked-issue checker, including Resolves and the inline-description field threshold.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/scripts/check-pr-linked-issue.mjs

@@ -106,7 +106,7 @@ export function checkLinkedIssue(body, prTitle = '') {
     passed,
     failures: passed ? [] : [
       'No linked issue or inline issue description found — either tag an existing issue ' +
-      'with `Fixes #NNN` / `Closes #NNN` / `Refs #NNN`, or describe the underlying issue ' +
+      'with `Fixes #NNN` / `Closes #NNN` / `Resolves #NNN` / `Refs #NNN`, or describe the underlying issue ' +
       'inline in the PR body following one of our issue templates ' +
       '(https://github.com/paperclipai/paperclip/tree/master/.github/ISSUE_TEMPLATE). ' +
       'See CONTRIBUTING.md → "Link Issues or Describe Them In-PR".',

.github/scripts/tests/check-pr-linked-issue.test.mjs

@@ -52,6 +52,7 @@ test('fails with no issue reference when no skip prefix', () => {
   const result = checkLinkedIssue('Added a cool feature, no issue linked', 'feat: something');
   assert.equal(result.passed, false);
   assert.ok(result.failures[0].includes('Fixes #NNN'));
+  assert.ok(result.failures[0].includes('Resolves #NNN'));
 });
 
 test('fails with cross-repo issue reference', () => {