Local LLMs need shared model storage

This is one of those unglamorous local-AI problems that matters more than it sounds. The ecosystem already has partial answers, but no universal storage convention, so users end up stitching together a workaround.

• –Ollama already supports moving its model store with `OLLAMA_MODELS`.
• –LM Studio also exposes a configurable models directory, so a single canonical store is viable in at least some stacks.
• –Where apps do not support a shared path, symlinks or a shared mount are the practical workaround, though they can be brittle.
• –The best long-term design is a shared blob store with per-app metadata, not duplicated weights per app.