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-agent-tech-writer/mermaid-gen.md

@@ -1,20 +0,0 @@
----
-name: mermaid-gen
-description: Create Mermaid-compliant diagrams
-menu-code: MG
----
-
-# Mermaid Generate
-
-Create a Mermaid diagram based on user description through multi-turn conversation until the complete details are understood.
-
-## Process
-
-1. **Understand the ask** — Clarify what needs to be visualized
-2. **Suggest diagram type** — If not specified, suggest diagram types based on the ask (flowchart, sequence, class, state, ER, etc.)
-3. **Generate** — Create the diagram strictly following Mermaid syntax and CommonMark fenced code block standards
-4. **Iterate** — Refine based on user feedback
-
-## Output
-
-A Mermaid diagram in a fenced code block, ready to render.