## Problem
When bd sync detected stale DB (>50% divergence), it would import JSONL to fix the DB,
but then immediately export the DB back to JSONL. This caused the stale DB to overwrite
the JSONL after a git pull, undoing cleanup work.
Example scenario:
1. Clone has 688 stale issues in DB (628 closed)
2. git pull brings JSONL with 62 issues (cleanup applied)
3. bd sync detects 1009.7% divergence and imports JSONL (DB → 62 issues) ✓
4. bd sync exports DB to JSONL (JSONL still 62 issues) ✓
5. But this marks JSONL as "changed" and commits/pushes it ✗
## Solution
After ZFC (JSONL First Consistency) import, set skipExport flag to prevent the export step.
JSONL is the source of truth after import - DB should sync to match, not export back.
## Changes
- cmd/bd/sync.go: Add skipExport flag, set it after ZFC import
- cmd/bd/sync.go: Wrap export logic in `if !skipExport` block
- CHANGELOG.md: Update ZFC entry with accurate description
- cmd/bd/sync_test.go: Add TestZFCSkipsExportAfterImport
Fixes #bd-l0r
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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