Configuration

TODO: this page will document every configurable setting Ostler exposes: where the config file lives, the schema, the defaults, and which settings can also be set via env vars or via the in-app preferences UI.

Each fix and feature must be configurable per Andy's productisation rule (see memory/feedback_productisation_patterns.md) – this page is where those config surfaces get catalogued.

Owner: @andy. Cross-reference: the ical-server.py config block, ZeroClaw's config.toml, and the channel configurator that CM051 ships.