A delegated child could arm reminders through the tools its preset mount
passes down, even though delivery can never reach a child's Session. The
refusal now reads the delegation-depth accounting the delegation cap itself
enforces, and the shipped presets deny the four tools to children outright:
- `reminderTargetRefusal` refuses when `delegationDepthOf(agent)` is above
zero, or when the Session is subagent-owned without a depth record.
- `standard`, `cordis`, and `ptc` set `toolFilter.deny` on both delegation
rows, so the four tools leave a child's prompt and reject execution.
`create` still rejects and `update` still returns the non-mutating refusal.
Chinesezjc
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