fix(dev): prune blockstore on devnet nodes 3 and 4

[rickyrombo]

Problem

Devnet nodes 3 and 4 never set OPENAUDIO_RETAIN_HEIGHT, so they inherited the 604800-block default and retained every devnet block while non-archive compaction ran every block. Each grew to 47GB in ./tmp on the host disk — 94GB between them, which is what filled my boot volume.

tmp/oap3-data/core/openaudio-devnet/data/blockstore.db   23G
tmp/oap3-data/core/openaudio-devnet/data/state.db        22G
tmp/oap3-data/postgres                                  657M

Why this is a config gap, not tuning

The sizes are inverted:

node	config	size
1	ARCHIVE=true — never prunes at all	4.2 GB
2	non-archive, RETAIN_HEIGHT=10	2.7 GB
3, 4	non-archive, no retain height	47 GB each

The node that keeps every block forever is the small one, so the 43GB excess isn't unpruned blocks — it's Pebble retaining everything because calculateLowestRetainHeight never advances the retain height (data_companion.go). This change matches node 2.

Note

OPENAUDIO_PRUNING_ENABLED, OPENAUDIO_PRUNING_AMOUNT and OPENAUDIO_PRUNING_EARLIEST_HEIGHT — which node 2 also sets — are read by no Go code. They're deliberately not copied here; only OPENAUDIO_RETAIN_HEIGHT has any effect. Worth removing from node 2 separately.

make down already does rm -rf tmp/oap*, so existing oversized data is reclaimed on the next teardown.

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