Add .beads/config.yaml support for template validation settings:
- validation.on-create: warn|error|none (default: none)
- validation.on-sync: warn|error|none (default: none)
When set to "warn", issues missing required sections (based on type) show
warnings but operations proceed. When set to "error", operations fail.
Implementation:
- Add validation keys to YamlOnlyKeys in yaml_config.go
- Add defaults in config.go
- Wire up bd create to check validation.on-create config
- Wire up bd sync to run validation before export
- Add tests for config loading
- Update CONFIG.md documentation
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>