Split AGENTS.md into area guides so Codex reads it in full again (#1046)

app/Build/AGENTS.md

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+# AGENTS.md
+
+These instructions cover preparing a release and crediting contributors. They add to the `AGENTS.md` in
+the repository root, which applies here as well; its "Changelogs" section explains how to write the
+changelog entries.
+
+## Release Process
+
+1. Create changelog file: `app/MindWork AI Studio/wwwroot/changelog/vX.Y.Z.md`
+2. Check that every contribution in the release is credited, see "Crediting contributors" below. The
+   authors of all pull requests merged since the last release are listed by
+   `gh pr list -R MindWorkAI/AI-Studio --state merged --limit 1000 --search "merged:>=<YYYY-MM-DD>" --json author --jq '[.[].author.login] | unique | .[]'`,
+   with the date of the last release tag from `git log -1 --format=%cs <last release tag>`; skip bots
+3. Commit changelog
+4. Run from `app/Build`: `dotnet run release --action <build|month|year>`
+5. Create PR with version bump and changes
+6. After PR merge, maintainer creates git tag: `vX.Y.Z`
+7. GitHub Actions builds release binaries for all platforms
+8. Binaries uploaded to GitHub Releases
+
+## Crediting contributors
+
+When a pull request is merged, or a release is prepared, check both places where we thank contributors.
+This holds for everybody except the maintainer, members of the core team included, not only for external
+contributors:
+
+- **The changelog entry of the change.** Thank the contributor at the end of the entry, in the form
+  ``<first name> <last name> (`<GitHub username>`)``, and call a first contribution out as such.
+- **The "Code Contributions" list on the supporters page** in `app/MindWork AI Studio/Pages/Supporters.razor`.
+  Add contributors who are not listed yet, one
+  `<Supporter Name="<GitHub username>" Type="SupporterType.INDIVIDUAL" URL="https://github.com/<GitHub username>" Acknowledgment="@T("…")"/>`
+  each, at the end of the list. The list is sorted by the first merged contribution of each person; someone
+  whom the changelog thanks for work inside another person's pull request counts from that pull request on.
+
+The acknowledgment calls the person by their first name, unless the credit choice below rules out their
+name, and says what they built. It never compares contributors or counts their contributions, and the
+order of the list is chronological only. Bug reports
+alone and commissioned work outside this repository get no entry on the supporters page; the changelog may
+still thank them.
+
+The credit choice in the pull request template is binding:
+
+- **"Credit me with my GitHub username only":** use the GitHub username alone. No real name, neither in
+  the changelog nor in the acknowledgment text.
+- **"Do not credit me":** neither a changelog mention nor an entry on the supporters page.
+- **No choice ticked, or a pull request from before the template:** the GitHub username plus the name, when
+  the contributor shows it publicly on their GitHub profile (`gh api users/<GitHub username> --jq .name`)
+  or an earlier changelog already thanked them by that name.
+
+Acknowledgments on the supporters page are `T()` texts, so the two steps of "Localization" in the root
+`AGENTS.md` apply: remind the developer to run the localization, then review the German value.

app/Build/CLAUDE.md

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+@AGENTS.md