* Uplift skill: add Resolves links for tracked issues to PR body
The uplift skill already discovers or creates a tracking issue for every
included PR in Step 7, but never surfaces those issue references on the
uplift PR itself. Collect each issue reference into a RESOLVED_ISSUES
list as it is encountered and, after Step 7's per-PR work, edit the
uplift PR body to prepend a Resolves directive per entry so the linked
issues are discoverable from the PR.
* Uplift skill: place Resolves lines under the Uplift list
Per review on the dogfood run, the `Resolves <ref>` directives belong
underneath the `Uplift of #XXXX` list rather than prepended above it.
Update Step 7's instructions and example so the new lines are spliced in
immediately after the last `Uplift of` line, and reflect the same in
Step 5's heads-up note.