feat(create): add require-description config option (GH#596)

Add create.require-description config option that enforces descriptions
when creating issues. When enabled, bd create will error if no
description is provided (except for test issues).

- Config in .beads/config.yaml or ~/.config/bd/config.yaml
- Also supports BD_CREATE_REQUIRE_DESCRIPTION env var
- Default: false (preserves current behavior with warning)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/config/config.go

@@ -109,6 +109,9 @@ func Initialize() error {
 	// Push configuration defaults
 	v.SetDefault("no-push", false)
 
+	// Create command defaults
+	v.SetDefault("create.require-description", false)
+
 	// Read config file if it was found
 	if configFileSet {
 		if err := v.ReadInConfig(); err != nil {