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/brainstorm-premise.md

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+# /brainstorm-premise Task
+
+When this command is used, execute the following task:
+
+<!-- Powered by BMAD™ Core -->
+
+# ------------------------------------------------------------
+
+# 1. Brainstorm Premise
+
+# ------------------------------------------------------------
+
+---
+
+task:
+id: brainstorm-premise
+name: Brainstorm Premise
+description: Rapidly generate and refine one‑sentence log‑line ideas for a new novel or story.
+persona_default: plot-architect
+steps:
+
+- Ask genre, tone, and any must‑have elements.
+- Produce 5–10 succinct log‑lines (max 35 words each).
+- Invite user to select or combine.
+- Refine the chosen premise into a single powerful sentence.
+  output: premise.txt
+  ...