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/write-document.md

@@ -1,20 +0,0 @@
----
-name: write-document
-description: Author a document following documentation best practices
-menu-code: WD
----
-
-# Write Document
-
-Engage in multi-turn conversation until you fully understand the ask. Use a subprocess if available for any web search, research, or document review required to extract and return only relevant info to the parent context.
-
-## Process
-
-1. **Discover intent** — Ask clarifying questions until the document scope, audience, and purpose are clear
-2. **Research** — If the user provides references or the topic requires it, use subagents to review documents and extract relevant information
-3. **Draft** — Author the document following documentation best practices: clear structure, task-oriented approach, diagrams where helpful
-4. **Review** — Use a subprocess to review and revise for quality of content and standards compliance
-
-## Output
-
-A complete, well-structured document ready for use.