feat(task): Add subagent-to-subagent delegation with budgets, persistent sessions, and hierarchical session navigation#7756

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Commits on Jan 24, 2026

feat(task): add subagent-to-subagent task delegation with configurable limits

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fix(task): use strict equality for callable_by_subagents check

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fix(task): change budget scope from per-message to per-session

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refactor(task): promote task_budget and callable_by_subagents to first-class config fields
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refactor(task): remove callable_by_subagents flag, use permissions-only approach

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fix(task): enforce permission checks for subagent-to-subagent delegation

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feat(tui): add hierarchical session navigation for subagent sessions
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feat(tui): add Root navigation hint for deep subagent sessions
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feat(tui): add session tree dialog with visual hierarchy and status indicators
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Commits on Jan 25, 2026

feat(task): add level_limit to prevent infinite delegation depth
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