conductor(plan): vendor_refresh_xai_rename_20260705 implementation plan
4 phases, 11 tasks: (1) full grok->xai rename across 5 layers, (2) per-vendor registry sync for 7 vendors against models.dev, (3) cost_tracker verification + full suite batch, (4) docs sync. TDD red-first per task. Per-vendor commits in Phase 2 for safe rollback.
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