Problem
When a fork sync encounters merge conflicts, users currently have no way to resolve them from the web UI. ADR-0018 Phase 4 covers conflict resolution and storage optimization.
Solution
Conflict Resolution
Detect merge conflicts during `sync()` and surface them in the UI
Side-by-side diff editor showing "yours" vs "theirs" with accept/reject controls per hunk
"Discard my changes" option: reset fork to upstream (`git reset --hard origin/main`)
"Keep my version" option: force-keep fork version and mark conflict resolvedStorage Optimization
Shared git objects between forks on the same filesystem (hardlinks)
Shallow clone depth tuning (currently `--depth=1`)
Fork deduplication: detect when multiple users fork the same repo and share read-only objects
Metrics: track disk usage per user and per forkPrerequisites
Per-user fork directories
Fork divergence detection