rename: opencortex → passepartout across memex

- .gitmodules: update submodule paths (projects/opencortex → projects/passepartout,
  projects/opencortex-contrib → projects/passepartout-contrib)
- gtd.org, README.org: update project references and display names
- check.lisp, gemini-vision.org, agora/TODO.org: update file paths
- dotemacs: update agenda paths and template config
- system/plans/: update all flight plan references
- system/backups/: update monolithic backup references

.gitmodules

@@ -1,9 +1,9 @@
 [submodule "opencortex"]
 	path = opencortex
 	url = ssh://git@10.10.10.201:2222/amr/opencortex.git
-[submodule "projects/opencortex"]
-	path = projects/opencortex
+[submodule "projects/passepartout"]
+	path = projects/passepartout
 	url = ssh://10.10.10.201:2222/amr/opencortex.git
-[submodule "projects/opencortex-contrib"]
-	path = projects/opencortex-contrib
+[submodule "projects/passepartout-contrib"]
+	path = projects/passepartout-contrib
 	url = ssh://git@10.10.10.201:2222/amr/opencortex-contrib.git