_docs/decisions-2026-10-23.md


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# Decisions — 2026-10-23

Provenance: reconstructed 2026-10-26 from the two feedback reports that reference this file
(`RPT-20261023-165659-9a6835ff`, `RPT-20261023-165656-29d32e82`). Both said "rationale written to
`_docs/decisions-2026-10-23.md`", but the file was absent — the decisions themselves were only
recorded inside those reports. Text below is verbatim from the reports.

---

## Section 10 — predictor store

**Decision:** Go per-user. Server file is canonical; the browser VFS is a TTL read-through cache,
written through on every save and read only when the server file is unreachable. The divergence
banner fires only when the cache is newer than the server, or the server is unreachable.
**Remove the second independent write path** — two writers is what produced the garbage pair in the
accuracy store.

## Section 6 — dispatch

**Decision:** spawn-on-demand; do **not** build the A2A mailbox — `_agents` has no mailbox dir and
`delegate_task` already auto-spawns. Change `Dispatch 0/3` to count delegations rather than queue
picks, relabel it as on-demand with a count of idle workers, and increment it inside `delegate_task`.

---

## Consequences for the feedback queue

- The predictor garbage-pair report (`RPT-20261023-153550-61b448d3`) is a *symptom of the second
  write path*: removing it is the fix, not cleaning the pair by hand.
- Section 6 has no mailbox work to schedule; any plan task that creates `_agents/*/mailbox` is void.