chore(agent): configure AI agents and tools

Add configuration for BMad, Claude, OpenCode, and other AI agent tools and 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
+  ...