Remove all coins except Palladium

coins.py keeps only Coin and the Palladium classes. The Bitcoin base class is
folded into Palladium. COIN now defaults to Palladium.

Tests and fixtures of the other coins are removed. test_blocks.py and
test_transactions.py are simplified: one test each, fed by the palladium
fixtures.

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

tests/server/test_env.py

@@ -91,56 +91,23 @@ def test_COIN_NET():
     '''Test COIN and NET defaults and redirection.'''
     setup_base_env()
     e = Env()
-    assert e.coin == lib_coins.BitcoinMainnet
+    assert e.coin == lib_coins.Palladium
     os.environ['NET'] = 'testnet'
     e = Env()
-    assert e.coin == lib_coins.BitcoinTestnet3
+    assert e.coin == lib_coins.PalladiumTestnet
     os.environ['NET'] = ' testnet '
     e = Env()
-    assert e.coin == lib_coins.BitcoinTestnet3
-    os.environ.pop('NET')
-    os.environ['COIN'] = ' Litecoin '
-    e = Env()
-    assert e.coin == lib_coins.Litecoin
-    os.environ['NET'] = 'testnet'
-    e = Env()
-    assert e.coin == lib_coins.LitecoinTestnet
-    os.environ.pop('NET')
-    os.environ['COIN'] = ' BitcoinGold '
-    e = Env()
-    assert e.coin == lib_coins.BitcoinGold
-    os.environ['NET'] = 'testnet'
-    e = Env()
-    assert e.coin == lib_coins.BitcoinGoldTestnet
+    assert e.coin == lib_coins.PalladiumTestnet
     os.environ['NET'] = 'regtest'
     e = Env()
-    assert e.coin == lib_coins.BitcoinGoldRegtest
+    assert e.coin == lib_coins.PalladiumRegtest
     os.environ.pop('NET')
-    os.environ['COIN'] = ' Decred '
+    os.environ['COIN'] = ' Palladium '
     e = Env()
-    assert e.coin == lib_coins.Decred
-    os.environ['NET'] = 'testnet'
-    e = Env()
-    assert e.coin == lib_coins.DecredTestnet
-    os.environ.pop('NET')
-    os.environ['COIN'] = ' BitcoinGreen '
-    e = Env()
-    assert e.coin == lib_coins.Bitg
-    os.environ['NET'] = 'mainnet'
-    e = Env()
-    os.environ.pop('NET')
-    os.environ['COIN'] = ' Pivx '
-    os.environ['NET'] = 'mainnet'
-    e = Env()
-    assert e.coin == lib_coins.Pivx
-    os.environ['NET'] = 'testnet'
-    e = Env()
-    assert e.coin == lib_coins.PivxTestnet
-    os.environ.pop('NET')
-    os.environ['NET'] = 'mainnet'
-    os.environ['COIN'] = ' TokenPay '
-    e = Env()
-    assert e.coin == lib_coins.TokenPay
+    assert e.coin == lib_coins.Palladium
+    os.environ['COIN'] = 'Bitcoin'
+    with pytest.raises(lib_coins.CoinError):
+        Env()
 
 
 def test_CACHE_MB():
@@ -273,7 +240,7 @@ def test_REPORT_SERVICES_localhost():
 
 def test_REORG_LIMIT():
     assert_integer('REORG_LIMIT', 'reorg_limit',
-                   lib_coins.Bitcoin.REORG_LIMIT)
+                   lib_coins.Palladium.REORG_LIMIT)
 
 
 def test_COST_HARD_LIMIT():
@@ -426,5 +393,5 @@ def test_ban_versions():
 
 
 def test_coin_class_provided():
-    e = Env(lib_coins.Bitcoin)
-    assert e.coin == lib_coins.Bitcoin
+    e = Env(lib_coins.Palladium)
+    assert e.coin == lib_coins.Palladium