chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

.claude/skills/bmad-module-builder/assets/setup-skill-template/assets/module-help.csv

@@ -1 +0,0 @@
-module,skill,display-name,menu-code,description,action,args,phase,after,before,required,output-location,outputs

.claude/skills/bmad-module-builder/assets/setup-skill-template/assets/module.yaml

@@ -1,6 +0,0 @@
-code:
-name: ""
-description: ""
-module_version: 1.0.0
-default_selected: false
-module_greeting: >