Copilot Skills: Release note generation skill should also quote co-authors (#45819)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

Release note generation skill add support for quoting co-authors

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## PR Checklist

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

Result may vary because of uncertainty of LLM, while I can get this
result during my tests

<img width="696" height="147" alt="image"
src="https://github.com/user-attachments/assets/9d20670f-b9fb-4630-b6b4-f94c2a5d2284"
/>

.github/skills/release-note-generation/references/step1-collection.md

@@ -1,6 +1,7 @@
 # Step 1: Collection and Milestones
 
 ## 1.0 To-do
+- 1.0.0 Verify GitHub CLI authentication (REQUIRED)
 - 1.0.1 Generate MemberList.md (REQUIRED)
 - 1.1 Collect PRs
 - 1.2 Assign Milestones (REQUIRED)
@@ -20,6 +21,34 @@
 
 ---
 
+## 1.0.0 Verify GitHub CLI Authentication (REQUIRED)
+
+⚠️ **BLOCKING:** The collection script requires an authenticated `gh` CLI to fetch PR metadata and co-author information via GitHub's GraphQL API. Without authentication, PR data and `NeedThanks` attribution will be incomplete.
+
+### Check authentication status
+
+```powershell
+gh auth status
+```
+
+**If authenticated:** You'll see `Logged in to github.com account <username>`. Proceed to 1.0.1.
+
+**If NOT authenticated:** Run the login flow before continuing:
+
+```powershell
+# Interactive login (opens browser for OAuth)
+gh auth login --hostname github.com --web
+
+# Or use a personal access token
+gh auth login --with-token <<< "YOUR_GITHUB_TOKEN"
+```
+
+**Required scopes:** `repo` (for reading PR data and assigning milestones)
+
+After login, verify again with `gh auth status` and confirm exit code 0.
+
+---
+
 ## 1.0.1 Generate MemberList.md (REQUIRED)
 
 Create `Generated Files/ReleaseNotes/MemberList.md` from the **PowerToys core team** section in [COMMUNITY.md](../../../COMMUNITY.md).
@@ -80,6 +109,8 @@ The script detects both merge commits (`Merge pull request #12345`) and squash c
 **Output** (in `Generated Files/ReleaseNotes/`):
 - `milestone_prs.json` - raw PR data
 - `sorted_prs.csv` - sorted PR list with columns: Id, Title, Labels, Author, Url, Body, CopilotSummary, NeedThanks
+  - `Author`: Comma-separated list of all contributors (PR opener + co-authors from commit trailers)
+  - `NeedThanks`: Comma-separated list of external contributors to thank (excludes core team members from MemberList.md). Empty string means no thanks needed.
 
 ---