feat(bmad): initialize comprehensive BMAD system with agents and configurations

Add complete BMAD method implementation including:
- 20+ specialized agents (dev, qa, pm, architect, etc.)
- 50+ reusable tasks for workflow automation
- IDE-specific configurations for Claude, Cursor, Gemini
- Chat modes and rule definitions for various environments
- Web bundles and team configurations
- Documentation and checklists for BMAD processes

This establishes the full BMAD ecosystem for collaborative development workflows.

.claude/commands/bmad-cw/tasks/expand-premise.md

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+# /expand-premise Task
+
+When this command is used, execute the following task:
+
+<!-- Powered by BMAD™ Core -->
+
+# ------------------------------------------------------------
+
+# 7. Expand Premise (Snowflake Step 2)
+
+# ------------------------------------------------------------
+
+---
+
+task:
+id: expand-premise
+name: Expand Premise
+description: Turn a 1‑sentence idea into a 1‑paragraph summary.
+persona_default: plot-architect
+inputs:
+
+- premise.txt
+  steps:
+- Ask for genre confirmation.
+- Draft one paragraph (~5 sentences) covering protagonist, conflict, stakes.
+  output: premise-paragraph.md
+  ...