v0.161.0

[0.161.0] - 2026-09-08

Added

• A durable delegation ledger — the record of who handed what work to whom (#3378).
  Three systems already described the fleet and none recorded the edge that carried the
  work: orgChart draws the capability graph and persists nothing, turn telemetry has no
  actor column and no edge (attribution is only "which instance's DB the row landed in"),
  and the in-flight delegation registry is an in-memory dict of cancel handles. So an
  operator could see how much an agent spent and who it could have delegated to, but
  never what actually flowed along which edge. A new per-instance ledger.db records one
  row per delegation — from-agent, target kind/name/instance, what was asked, outcome,
  duration, and cost where it is genuinely known — joinable to turns on
  task_id/session_id.
• Written through one seam, wired to every dispatch funnel (#3378).
  graph/ledger.py::record_delegation is the single writer, mirroring
  record_turn: a new dispatch surface routes through it or its edge goes unrecorded.
  All three existing funnels are wired — in-process subagents (task, task_batch, SDK),
  every external delegate (and therefore delegate_to, the coder ladder and the board
  loop), and background subagent jobs. That third one matters: a background job never
  passes through the in-process funnel — it is fired as a self-directed A2A turn — which
  is the same shape of blind spot that made CLI coding-agent runs invisible to turn
  telemetry for months (#3015). Plugins reach the same seam via sdk.record_delegation.
• An unknown cost is stored as NULL, never as zero (#3378).
  Only some paths carry a real number. A confident 0 would make an unmeasured coder look
  free and silently understate every rollup built on the column, so the aggregate also
  reports how many rows were actually priced. Subagent edges deliberately record no cost
  at all: that spend is already billed to the parent turn's telemetry, and storing it here
  too would double-count the same work against itself.

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Full Changelog: v0.160.0...v0.161.0