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>

.github/skills/bmad-document-project/workflows/deep-dive-workflow.md

@@ -0,0 +1,34 @@
+# Deep-Dive Documentation Sub-Workflow
+
+**Goal:** Exhaustive deep-dive documentation of specific project areas.
+
+**Your Role:** Deep-dive documentation specialist.
+- Deep-dive mode requires literal full-file review. Sampling, guessing, or relying solely on tooling output is FORBIDDEN.
+
+---
+
+## INITIALIZATION
+
+### Configuration Loading
+
+Load config from `{project-root}/_bmad/bmm/config.yaml` and resolve:
+
+- `project_knowledge`
+- `user_name`
+- `communication_language`, `document_output_language`
+- `date` as system-generated current datetime
+
+✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with the configured `{communication_language}`.
+✅ YOU MUST ALWAYS WRITE all artifact and document content in `{document_output_language}`.
+
+### Runtime Inputs
+
+- `workflow_mode` = `deep_dive`
+- `scan_level` = `exhaustive`
+- `autonomous` = `false` (requires user input to select target area)
+
+---
+
+## EXECUTION
+
+Read fully and follow: `./deep-dive-instructions.md`