`hermes -z --usage-file` copied only the main-loop result, so title generation,
vision, compression, web_extract and background-review calls — recorded per task
in session_model_usage — never reached the pipeline ledger the flag advertises
as "so pipelines can always account for spend". The Insights page already folds
those rows in (#23270); the ledger is now consistent with it.
- SessionDB.auxiliary_usage_by_task(session_id): per-task sums over the
session's compression lineage (aux calls bill to the id the turn started with
while compression mints child ids mid-turn).
- oneshot snapshots aux usage before the turn and attaches the delta after it,
so a resumed session's earlier runs are not re-billed.
- The report gains `auxiliary` (totals + `by_task`) and
`total_including_auxiliary`; every existing key keeps its main-loop meaning.
- The auto-title upgrade runs on a daemon thread and can still be writing when
the turn returns: title_generator tracks in-flight upgrade threads and
oneshot joins them (bounded) before reading — no sleep, no eager read.
Fixes#112848. Direction shared with #112852 (@KoNit-K), which folded aux into
the headline counters; this keeps them backward compatible instead.
Co-authored-by: KoNit-K <124019182+KoNit-K@users.noreply.github.com>
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