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

projects/dotemacs/modules/emacs-gtd.el

@@ -8,6 +8,7 @@
 			(concat org-directory "/inbox.org")
 			(concat org-directory "/gtd.org")
 			(concat org-directory "/org-gtd-tasks.org")
+			(concat org-directory "/projects/passepartout/TODO.org")
 			)
       )
 

projects/dotemacs/modules/emacs-gtd.org

@@ -18,7 +18,7 @@ Agenda files
 			(concat org-directory "/inbox.org")
 			(concat org-directory "/gtd.org")
 			(concat org-directory "/org-gtd-tasks.org")
-			(concat org-directory "/projects/opencortex/TODO.org")
+			(concat org-directory "/projects/passepartout/TODO.org")
 			)
         )