CodeBurn v0.9.22 groups agent sessions into provider-recorded work units, and fails closed rather than guessing lineage

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Released 2026-08-25, the AI coding cost tracker (9,683 stars, covering 37 tools) adds `codeburn sessions --by-work-unit`, folding each session that carries a lineage field under the orchestration root it names, with cost and calls summed over root plus children. The evidence rules are strict: a session without lineage is its own standalone unit marked role unknown, a parent id outside the parsed window leaves the child ungrouped, and cycles, self-references and cross-provider id collisions never fold. That matters because it makes multi-agent orchestration spend attributable to a single root task instead of a flat list of sessions.