yoi/.yoi/tickets/00001KXRXAJFZ/resolution.md

Implemented reusable Worker-internal runner and migrated memory extract to use it.

The new runner provides a Worker-owned path for isolated internal LLM jobs with caller-supplied prompt, input, limited tools, cache key, max turns, and usage capture. Memory extract now uses this runner while preserving the existing trigger and staging behavior.

Validation passed:

• cargo fmt --check
• cargo test -p memory
• cargo test -p worker
• nix build .#yoi