- Add mappings array support to git_mount entries
- Clone repository once per git_mount entry, mount multiple subdirectories
- Normalize legacy source_path+target_path to mappings on read
- Update _merge_git_mounts to dedup by (remote_url, branch) and concatenate mappings
- Add _normalize_git_mount, _clone_git_repo, _resolve_git_mount_mappings helpers
- Update GitMountItem Pydantic model with GitMountMapping and model_validator
- Update frontend GitMountEditor component with mappings UI
- Auto-convert legacy git mount entries to mappings format on load
- Add 15 backend unit tests for normalization, resolution, and glob expansion
- Update existing config profile resolver tests for new merge behavior
Quality gates: pytest 167 passed, frontend typecheck clean
Addresses: config-profile-multi-repo-mounts
Alex Blank