fix(ci): fix workflow by adding working-directory, fetch script, and removing npm ci

- Set defaults.run.working-directory to .github/issue-resolution so
  scripts resolve from the correct path
- Remove npm ci step (no npm dependencies needed)
- Add fetch-candidates.mjs to gather open issues with comments and
  timeline events via GitHub REST API
- Add minimal package.json with type: module

.github/issue-resolution/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "issue-resolution",
+  "private": true,
+  "type": "module"
+}