Convert mealie_get_recipe, mealie_meal_plans, mealie_todays_meals,
mealie_shopping_lists, obsidian_read_note, journal_get_today,
obsidian_search_notes and simba_search to content_and_artifact. The text
the LLM sees is unchanged; the artifact is a JSON-safe ToolArtifact dict
per the Cowork UI contract (mealie.recipe, mealie.meal_plan,
mealie.shopping_lists, obsidian.note, search.documents). Error, empty and
not-configured paths return no artifact.
simba_search's artifact changes from a list of Documents (unused) to a
search.documents dict.
New optional env vars: MEALIE_GROUP_SLUG (default "home") for Mealie v2
recipe links, OBSIDIAN_VAULT_NAME for obsidian://open links.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ryan Chen