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-builder/assets/CAPABILITIES-template.md

@@ -1,30 +0,0 @@
-# Capabilities
-
-## Built-in
-
-| Code | Name | Description | Source |
-|------|------|-------------|--------|
-{capabilities-table}
-
-{if-evolvable}
-## Learned
-
-_Capabilities added by the owner over time. Prompts live in `capabilities/`._
-
-| Code | Name | Description | Source | Added |
-|------|------|-------------|--------|-------|
-
-## How to Add a Capability
-
-Tell me "I want you to be able to do X" and we'll create it together.
-I'll write the prompt, save it to `capabilities/`, and register it here.
-Next session, I'll know how. Load `./references/capability-authoring.md` for the full creation framework.
-{/if-evolvable}
-
-## Tools
-
-Prefer crafting your own tools over depending on external ones. A script you wrote and saved is more reliable than an external API. Use the file system creatively.
-
-### User-Provided Tools
-
-_MCP servers, APIs, or services the owner has made available. Document them here._