chore: initial commit of planning artifacts

.claude/commands/bmad/core/tasks/index-docs.md

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+---
+description: 'Generates or updates an index.md of all documents in the specified directory'
+---
+
+# Index Docs
+
+LOAD and execute the task at: _bmad/core/tasks/index-docs.xml
+
+Follow all instructions in the task file exactly as written.

.claude/commands/bmad/core/tasks/shard-doc.md

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+---
+description: 'Splits large markdown documents into smaller, organized files based on level 2 (default) sections'
+---
+
+# Shard Document
+
+LOAD and execute the task at: _bmad/core/tasks/shard-doc.xml
+
+Follow all instructions in the task file exactly as written.