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A hand-damaged preset was silent until the worst moment. An unparsable composition listed as an ordinary selectable row and failed only at the next session start — set as default, every new session failed. A directory whose composition file was deleted vanished from the roster while still occupying its id: copy answered "delete the existing preset first" while remove answered "not found", a dead end. Discovery now owns health: every id-shaped directory is a roster slot, broken when its composition is missing or unloadable, checked with the loader's own entryListSchema dialect (!!js included) so health never rejects what the loader accepts. `broken` rides AgentPreset, the agentPreset.list entry, and the UI row; mount/recompose/standingKeyFor refuse broken up front with the discovery-reported reason, while resolve/read/remove still answer. The section renders marked red cards — unselectable, uncopyable, deletable, location kept on custom rows — and both pickers drop broken rows entirely. The cordis preset's persona now forbids editing the shipped install (corrupting cordis would disable the mode itself) and points authoring at $DSH_HOME/.agent-presets; its skill teaches preset.yml metadata, the copy-first workflow, the one-escalation sandbox reality, and honest verification. Exercised live: asked to edit the shipped composition the composed agent refuses citing both rules; asked for real presets (simple and complex) it lands them under the user root with one approved escalation each and self-checks with the loader dialect.