docs: add project glossary

Author: cschanhniem

docs/PROJECT-GLOSSARY.md

@@ -0,0 +1,17 @@
+# Project Glossary
+
+Open Problem Lab should keep repeated review terms consistent.
+
+| Term | Working meaning |
+|---|---|
+| Accepted | Passed review for its stated scope. |
+| Bounded | Useful only under a narrower scope. |
+| Field-pending | Needs real-world context before action. |
+| Archived | Preserved for history, not active support. |
+| Load-bearing | Other work depends on it. |
+| Review route | The reviewer type needed for the artifact. |
+| Recheck trigger | Event that should force another look. |
+
+## Acceptance test
+
+A term belongs here when inconsistent wording would confuse review, routing, or artifact status.