Implements bd-zwtq: After bd init completes, run doctor diagnostics
to catch configuration problems before user encounters them in normal
workflow. If any warnings or errors are detected, show a summary with
issue names and messages, then direct user to run 'bd doctor --fix'.
This helps users immediately identify and fix setup issues like:
- Missing git hooks
- Unconfigured merge driver
- Missing agent documentation
- Metadata tracking not initialized
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Co-Authored-By: Claude <noreply@anthropic.com>