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

system/plans/flight-plan-emacs-bridge.org

@@ -11,7 +11,7 @@ The current =opencortex= kernel is a "one-way" sensory system. It receives stimu
 
 ** Coder Phase
 - [X] Create =inbox/flight-plan-emacs-bridge.org= (this file).
-- [ ] Update =projects/opencortex/docs/README.org= (Literate Kernel) with the stream-passing hook.
+- [ ] Update =projects/passepartout/docs/README.org= (Literate Kernel) with the stream-passing hook.
 - [ ] Update =notes/org-skill-emacs-bridge.org= to implement the Harness Protocol outbound writer.
 - [ ] Tangle the updated files.
 - [ ] Rebuild the daemon binary.