chore: remove BMAD framework files and IDE configuration artifacts

Clean up unused BMAD workflow, agent, and command files across all IDE
configurations (.agent, .clinerules, .cursor, .gemini, .github, .kilocode,
.opencode) and internal module files (_bmad/bmb, _bmad/bmm).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.opencode/skills/bmad-sprint-planning/checklist.md

@@ -0,0 +1,33 @@
+# 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)