6435463edc
The regression for `PresetTree.write` lived two layers up, so this layer's own assertion could not fail: it checked the file after an ordinary teardown, and the Loader's unload listener returns early when the whole tree is being disposed, so the override never ran. Moves the self-disposing-row test down to the layer that adds the override, in a temp root so a committed fixture cannot be damaged by the run that proves the bug.
preset/ — per-session agent composition
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An agent preset is a directory holding one agent.cordis.yml. Mounting it under an agent's scope context gives that session its own tools and prompt sections while every other live session keeps its own, so one process can run several differently composed agents at once.
| Package | Role | ctx key |
|---|---|---|
agent-presets/ |
Preset vocabulary, filesystem discovery over trusted and user-authored roots, and the guarded per-agent mount | ctx.agentPresets |
persona/ |
The agent persona as a composable row, so a preset can change identity and not only tools | — |
The composition split this group assumes: registries and cross-session facilities are process singletons and stay in the host composition, while a preset carries what one agent contributes to them. A preset that names a row publishing a process-global service is rejected at mount rather than allowed to collide with the next session.
Design: the per-session agent-preset note.