docs(adr): ADR-034 names the settings for what they are

TAPIR_RECONCILE_BASE_MODEL, not 'second model': the engine added to turn the
feature on is the one whose TEXT is the base, and the old name hid that. All three
models must be local aliases; the base must differ from the other engine. ADR is
still Proposed, so this is an in-place correction.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

DECISIONS.md

@@ -1601,10 +1601,13 @@ Mode on iguana is the unproven suspect).
    plain words what was done — "reconciled from two transcripts: N differences, K uncertain" — and
    lists the uncertain spots. A reconciled transcript is never presented as simply "the" transcript.
 
-7. **Configuration.** `TAPIR_TRANSCRIBE_SECOND_MODEL` (empty = off), `TAPIR_RECONCILE_MODEL`
-   (required when a second engine is set), `TAPIR_RECONCILE_CHECK_ORDER` (off). The default job
-   timeout rises from 30 to 60 minutes: ~4 min of kb-whisper and ~40 s of pianissimo per hour of audio,
-   plus the adjudication.
+7. **Configuration.** `TAPIR_RECONCILE_BASE_MODEL` (empty = off; the engine whose text is the base,
+   e.g. `iguana/pianissimo` — `TAPIR_TRANSCRIBE_MODEL` stays the other engine, e.g. kb-whisper),
+   `TAPIR_RECONCILE_MODEL` (the adjudicator; required when a base engine is set),
+   `TAPIR_RECONCILE_CHECK_ORDER` (off). All three models must be local aliases (`koala/` or `iguana/`):
+   a cloud alias is a start-up error, and the base engine must differ from the other one. The default
+   job timeout rises from 30 to 60 minutes: ~4 min of kb-whisper and ~40 s of pianissimo per hour of
+   audio, plus the adjudication.
 
 8. **Not decided here.** A cloud adjudicator (rejected: private content); tuning the prompt; making
    `gemma4-31b` the default; a "reconciling" progress state (the page says "transcribing" for the whole