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

.agent/skills/bmad-create-architecture/architecture-decision-template.md

@@ -1,12 +0,0 @@
----
-stepsCompleted: []
-inputDocuments: []
-workflowType: 'architecture'
-project_name: '{{project_name}}'
-user_name: '{{user_name}}'
-date: '{{date}}'
----
-
-# Architecture Decision Document
-
-_This document builds collaboratively through step-by-step discovery. Sections are appended as we work through each architectural decision together._