Add support for Docker Desktop's built-in Model Runner as a fourth
runtime provider alongside Ollama, llama.cpp, and MLX. Detection probes
the OpenAI-compatible /v1/models endpoint on localhost:12434 (configurable
via DOCKER_MODEL_RUNNER_HOST). Downloads use `docker model pull`.
A new scraper (scripts/scrape_docker_models.py) queries Docker Hub's ai/
namespace and cross-references against the HF model database to produce
an embedded catalog (docker_models.json) of confirmed available models.
Only models verified in the catalog appear as downloadable via Docker.
- Provider: detect, list installed, pull via docker CLI
- TUI: status bar shows Docker availability, 'D' in Inst column,
provider picker includes Docker Model Runner
- Inst column refactored from enum to bitfield for extensibility
- Makefile: `make update-catalogs` refreshes all scrapers and rebuilds
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
