Cost was written through three independent paths: worker-runner shipped
`finalUsage.costUsd` in run-finished -> finishRun wrote `runs.cost_usd`,
`tasks.cost_usd += costUsd`, `agents.spent_monthly_usd += costUsd`, and
inserted a per-run aggregate row in cost_entries. CostWriter
additionally inserted per-message rows in cost_entries from main. Any
CostWriter failure created silent drift between `SUM(cost_entries)`
(read by budget enforcement) and `runs.cost_usd` (read by the UI).
Make CostWriter the single writer, finishRun the single reader.
- Add `db.recordCostEntry(...)` as the first-class insert path for
per-message cost rows. CostWriter calls it; tests call it directly.
- Remove the aggregate INSERT from finishRun. finishRun now reads
`SELECT COALESCE(SUM(amount_usd), 0) FROM cost_entries WHERE run_id=?
AND unattributed=0` and writes that as the authoritative run total to
runs.cost_usd, tasks.cost_usd, and agents.spent_monthly_usd.
- Drop `costUsd` from `finishRun` input, the worker `run-finished`
ChildMessage shape, the automation `RunFinishedEvent` type, and every
caller + test fixture. Cost is owned by the per-message path.
- worker-runner stops extracting `usage.cost.total` — token counts stay
for session accumulation, cost comes from pi-ai via CostWriter.
- run-finished-helpers now gates budget incident checks on
`event.status === "succeeded"` instead of a cost field that no longer
exists on the event.
- automation-run-completion fires `budget_threshold` on every succeeded
run (post-run spent_monthly_usd already reflects the SUM path).
- Update budget tests to write a `recordCostEntry` before `finishRun`
to simulate the per-message cost path; drop `costUsd` from cross-
subsystem, edge-case-budget, database, and related fixtures.
One writer, one reader, one source of truth. No drift.
- DB introspection tests: introduce local RawDb alias for casts
that poke into the private .db handle.
- IPC handler tests: introduce IpcHandler alias matching the
registerHandle signature (event + unknown args).
- selective-ipc / session-management: narrow handler and data
params to unknown or the minimum shape the code reads.
- Fix SQLInputValue type in listWakeupRequests params
- Fix leftover pendingWakes reference in worker-service.ts
- Fix RunStatus 'completed' -> 'succeeded' in atomic-checkout test
- Update autonomous-chain.spec.ts to use new wakeup lifecycle API
- 8 test cases covering CAS semantics, lock release on finishRun/deleteAgent, stale recovery
- Tests expect STALE_LOCK_TIMEOUT_MS export, checkout_run_id/execution_locked_at columns
- RED phase: 5 of 8 tests fail as expected before implementation
ZacharyZhang-NY