S19: own shared agent workflows and document multi-project runner onboarding

skills/adr-brainstorm/ATTRIBUTION.md

@@ -0,0 +1,24 @@
+# License and attribution
+
+ADR brainstorm is maintained by Wanja Krah and is distributed under the MIT
+License. See [LICENSE.wanjakrah](LICENSE.wanjakrah) for the license covering
+Wanja Krah's original contributions.
+
+The design-tree approach and related interviewing guidance in `SKILL.md` were
+adapted from Matt Pocock's `grilling` skill, invoked by his `grill-me` skill.
+This includes tracking dependent decisions, settling prerequisites before
+asking dependent questions, investigating accessible facts, and leaving
+decisions with the user. The wording and workflow have been adapted for ADR
+brainstorming; this is not an unmodified copy of the upstream skill.
+
+Upstream source:
+- Repository: https://github.com/mattpocock/skills
+- Revision: `59db609eb1e18aaf59b63284d0e52255aff0c63c`
+- Paths: `skills/productivity/grilling` and `skills/productivity/grill-me`
+- License: MIT, copyright (c) 2026 Matt Pocock
+
+Matt Pocock's full copyright and license notice is preserved in
+[LICENSE.mattpocock](LICENSE.mattpocock) for the adapted material. Keep both
+license files with redistributed copies or substantial portions of this skill.
+The two notices preserve attribution under the same MIT terms; they do not
+introduce an additional license restriction or imply upstream endorsement.