fix: increase TAP memory to prevent OOM kills
TAP was getting OOM killed while parsing large repo CARs (20-30MB)
during resync. Increased memory from 512MB to 1GB and reduced
parallelism from 5 to 2 workers to prevent memory exhaustion.
This fixes the TAP->backend connection instability where connections
would drop every ~40-60s due to TAP crashing.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>