ContentHash and SourceRepo were being exported to beads.jsonl even though
they are internal database fields. This caused JSONL pollution where every
issue got these extra fields, and re-exports would produce different output
than the original clean JSONL.
Changed JSON tags from `json:"...,omitempty"` to `json:"-"` for:
- ContentHash: Internal optimization field for content-based diffing
- SourceRepo: Internal metadata for multi-repo support
This fixes the ZFC resurrection bug where re-exports after import would
pollute the JSONL with internal fields.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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