Fix missing Odoo module dependency declarations

Four __manifest__.py files were missing declared dependencies on modules
they already reference via comodel_name fields:
- encoach_exam: add encoach_taxonomy (defines encoach.subject)
- encoach_subscription: add encoach_taxonomy
- encoach_training: add encoach_taxonomy
- encoach_courseware: add encoach_assignment (defines encoach.assignment)

Without these, Odoo's module loader throws AssertionError on unknown
comodel_name and refuses to initialize the registry.

Made-with: Cursor

new_project/custom_addons/encoach_exam/__manifest__.py

@@ -4,7 +4,7 @@
     'category': 'Education',
     'summary': 'AI-powered exam management: structures, rubrics, exercises',
     'author': 'EnCoach',
-    'depends': ['encoach_core'],
+    'depends': ['encoach_core', 'encoach_taxonomy'],
     'data': [
         'security/ir.model.access.csv',
     ],