Hierarchical configuration

To be decided

Hierarchical configuration (knot.toml in any ancestor directory)

The issue only identifies hierarchical configuration via knot.toml files in ancestor directories and does not name implementation files, tests, or entry points. Start by locating the existing knot.toml configuration loading code and its tests, then clarify the intended precedence and discovery behavior before implementation. Done should include an agreed design and coverage for ancestor-directory configuration.

Written by the indexing model from the issue text.