Merge pull request 'docs: define canonical E2E ownership' (#52) from docs/e2e-source-ownership into main

Reviewed-on: #52

AGENTS.md

@@ -10,6 +10,12 @@
 - Update an existing pull request when follow-up work belongs to its scope; open another only for an independent change.
 - Merge only when the user explicitly authorizes the named pull request or branch.
 
+## E2E Ownership
+
+- Canonical E2E fixture source repositories are `Maidn/maidn-e2e-*`.
+- The testing suite, onboarding, and mutation E2E commands must target `Maidn` fixture sources.
+- `test-org-2` is disposable execution state only. It may host temporary delivery branches and resources, but it is never a fixture source or test-suite owner.
+
 ## Required Checks
 
 - Before each commit: inspect `git status --short`, `git diff --check`, and `git log --oneline -10`.