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-sprint-planning/checklist.md

@@ -1,33 +0,0 @@
-# Sprint Planning Validation Checklist
-
-## Core Validation
-
-### Complete Coverage Check
-
-- [ ] Every epic found in epic\*.md files appears in sprint-status.yaml
-- [ ] Every story found in epic\*.md files appears in sprint-status.yaml
-- [ ] Every epic has a corresponding retrospective entry
-- [ ] No items in sprint-status.yaml that don't exist in epic files
-
-### Parsing Verification
-
-Compare epic files against generated sprint-status.yaml:
-
-```
-Epic Files Contains:                Sprint Status Contains:
-✓ Epic 1                            ✓ epic-1: [status]
-  ✓ Story 1.1: User Auth              ✓ 1-1-user-auth: [status]
-  ✓ Story 1.2: Account Mgmt           ✓ 1-2-account-mgmt: [status]
-  ✓ Story 1.3: Plant Naming           ✓ 1-3-plant-naming: [status]
-                                      ✓ epic-1-retrospective: [status]
-✓ Epic 2                            ✓ epic-2: [status]
-  ✓ Story 2.1: Personality Model      ✓ 2-1-personality-model: [status]
-  ✓ Story 2.2: Chat Interface         ✓ 2-2-chat-interface: [status]
-                                      ✓ epic-2-retrospective: [status]
-```
-
-### Final Check
-
-- [ ] Total count of epics matches
-- [ ] Total count of stories matches
-- [ ] All items are in the expected order (epic, stories, retrospective)