docs: add output note

docs/evidence/OUTPUT_NOTE.md

@@ -0,0 +1,23 @@
+# Output Note
+
+OpenAMP Foundry should make outputs easy to inspect and compare.
+
+```markdown
+## Output note
+
+**Output path:** File or directory.
+
+**Created by:** Command, workflow, or script.
+
+**Inputs:** Configs or upstream files.
+
+**Purpose:** Why this output exists.
+
+**Review status:** unchecked | checked | review-needed | superseded.
+
+**Next action:** keep | regenerate | remove after review.
+```
+
+## Acceptance test
+
+An output note is useful when another contributor can tell why an output exists, how it was produced, and whether it should be trusted, regenerated, or removed.