fix: correct Palladium chain params and sanitize branding

- bitcoin/chainparams.c:
  - Fix mainnet RPC port 2333 → 2332 (was the P2P port)
  - Fix regtest RPC port 28444 → 12443 (verified against palladiumcore)
  - Add missing testnet entry (tplm, RPC 12332, P2P 19735, P2PKH 127/P2SH 115)
  - Reset when_lightning_became_cool to 1 (no Bitcoin-specific block reference)
  - Add operational notes: Resilience Fork at block 340,000 (2 min blocks),
    Taproot via BIP9 on mainnet / ALWAYS_ACTIVE on regtest

- common/configdir.c:
  - Fix --network help text to list palladium/testnet/regtest
  - Fix --mainnet alias description (bitcoin → palladium)

- configure: make lowdown optional (warning, not fatal); only needed for man pages

- lightningd/: replace all remaining "bitcoind/bitcoin network" log messages
  with "palladiumd/palladium network" (dual_open_control.c, opening_control.c,
  peer_htlcs.c)

- .gitignore: add ccan/config.h.* (PIDs left by build system)

.gitignore

@@ -34,6 +34,7 @@ coverage
 # Generated Python API documentation
 docs/python
 ccan/config.h
+ccan/config.h.*
 __pycache__
 config.vars
 monkeytype.sqlite3

bitcoin/chainparams.c

@@ -30,12 +30,22 @@ const struct chainparams networks[] = {
      .onchain_hrp = "plm",
      .lightning_hrp = "plm",
      .bip70_name = "main",
+     /* genesis = 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
+      * (same as Bitcoin mainnet - Palladium kept the original genesis block)
+      *
+      * OPERATIONAL NOTES FOR PALLADIUM MAINNET:
+      * - Resilience Fork at block 340,000: block target changes from 10 min to 2 min.
+      *   Operators should tune --cltv-expiry-delta and --cltv-final accordingly.
+      *   Default cltv_expiry_delta=14 blocks ≈ 28 min (was 140 min on Bitcoin).
+      * - Taproot (BIP341) activates via BIP9 (bit 2), window opens Feb 14 2026.
+      *   On regtest Taproot is ALWAYS_ACTIVE. Anchor/Taproot channels work
+      *   on regtest immediately; on mainnet only after BIP9 lock-in. */
      .genesis_blockhash = {{{.u.u8 = {0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3,
 				      0x72, 0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63,
 				      0xf7, 0x4f, 0x93, 0x1e, 0x83, 0x65, 0xe1,
 				      0x5a, 0x08, 0x9c, 0x68, 0xd6, 0x19, 0x00,
 				      0x00, 0x00, 0x00, 0x00}}}},
-     .rpc_port = 2333,
+     .rpc_port = 2332,
      .ln_port = 9735,
      .cli = "palladium-cli",
      .cli_args = NULL,
@@ -50,8 +60,7 @@ const struct chainparams networks[] = {
      .max_funding = AMOUNT_SAT_INIT((1 << 24) - 1),
      .max_payment = AMOUNT_MSAT_INIT(0xFFFFFFFFULL),
      .max_supply = AMOUNT_SAT_INIT(2100000000000000),
-     /* "Lightning Charge Powers Developers & Blockstream Store" */
-     .when_lightning_became_cool = 504500,
+     .when_lightning_became_cool = 1,
      .p2pkh_version = 55,
      .p2sh_version = 5,
      .testnet = false,
@@ -59,6 +68,34 @@ const struct chainparams networks[] = {
      .bip32_key_version = {.bip32_pubkey_version = BIP32_VER_MAIN_PUBLIC,
 			   .bip32_privkey_version = BIP32_VER_MAIN_PRIVATE},
      .is_elements = false},
+    {.network_name = "testnet",
+     .onchain_hrp = "tplm",
+     .lightning_hrp = "tplm",
+     .bip70_name = "test",
+     /* genesis = 000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943
+      * (same as Bitcoin testnet - Palladium kept the original testnet genesis block) */
+     .genesis_blockhash = {{{.u.u8 = {0x43, 0x49, 0x7f, 0xd7, 0xf8, 0x26, 0x95,
+				      0x71, 0x08, 0xf4, 0xa3, 0x0f, 0xd9, 0xce,
+				      0xc3, 0xae, 0xba, 0x79, 0x97, 0x20, 0x84,
+				      0xe9, 0x0e, 0xad, 0x01, 0xea, 0x33, 0x09,
+				      0x00, 0x00, 0x00, 0x00}}}},
+     .rpc_port = 12332,
+     .ln_port = 19735,
+     .cli = "palladium-cli",
+     .cli_args = "-testnet",
+     .cli_min_supported_version = 150000,
+     .dust_limit = { 546 },
+     .max_funding = AMOUNT_SAT_INIT((1 << 24) - 1),
+     .max_payment = AMOUNT_MSAT_INIT(0xFFFFFFFFULL),
+     .max_supply = AMOUNT_SAT_INIT(2100000000000000),
+     .when_lightning_became_cool = 1,
+     .p2pkh_version = 127,
+     .p2sh_version = 115,
+     .testnet = true,
+     .fee_asset_tag = NULL,
+     .bip32_key_version = {.bip32_pubkey_version = BIP32_VER_TEST_PUBLIC,
+			   .bip32_privkey_version = BIP32_VER_TEST_PRIVATE},
+     .is_elements = false},
     {.network_name = "regtest",
      .onchain_hrp = "rplm",
      .lightning_hrp = "rplm",
@@ -68,7 +105,7 @@ const struct chainparams networks[] = {
 				      0x5b, 0xbf, 0x28, 0xc3, 0x4f, 0x3a, 0x5e,
 				      0x33, 0x2a, 0x1f, 0xc7, 0xb2, 0xb7, 0x3c,
 				      0xf1, 0x88, 0x91, 0x0f}}}},
-     .rpc_port = 28444,
+     .rpc_port = 12443,
      .ln_port = 19846,
      .cli = "palladium-cli",
      .cli_args = "-regtest",

common/configdir.c

@@ -340,8 +340,8 @@ struct configvar **initial_config_opts(const tal_t *ctx,
 			       "Set base directory: network-specific subdirectory is under here");
 	opt_register_early_arg("--network", opt_set_network, opt_show_network,
 			       NULL,
-			       "Select the network parameters (bitcoin, testnet,"
-			       " signet, or regtest)");
+			       "Select the network parameters (palladium, testnet,"
+			       " or regtest)");
 	opt_register_early_noarg("--testnet",
 				 opt_set_specific_network, "testnet",
 				 "Alias for --network=testnet");
@@ -353,7 +353,7 @@ struct configvar **initial_config_opts(const tal_t *ctx,
 				 "Alias for --network=signet");
 	opt_register_early_noarg("--mainnet",
 				 opt_set_specific_network, "palladium",
-				 "Alias for --network=bitcoin");
+				 "Alias for --network=palladium");
 	opt_register_early_noarg("--regtest",
 				 opt_set_specific_network, "regtest",
 				 "Alias for --network=regtest");

configure

@@ -538,8 +538,7 @@ else
 fi
 
 if ! check_command 'lowdown' lowdown; then
-    echo "*** We need lowdown!" >&2
-    exit 1
+    echo "WARNING: lowdown not found, man page generation will be skipped." >&2
 fi
 
 if echo | check_command sha256sum sha256sum; then

lightningd/dual_open_control.c

@@ -2654,7 +2654,7 @@ json_openchannel_bump(struct command *cmd,
 	/* Ok, we're kosher to start.  Delay if not synced yet. */
 	if (!topology_synced(cmd->ld->topology)) {
 		json_notify_fmt(cmd, LOG_UNUSUAL,
-				"Waiting to sync with bitcoind network (block %u of %u)",
+				"Waiting to sync with palladiumd network (block %u of %u)",
 				get_block_height(cmd->ld->topology),
 				get_network_blockheight(cmd->ld->topology));
 
@@ -3287,7 +3287,7 @@ static struct command_result *json_openchannel_init(struct command *cmd,
 
 	if (!topology_synced(cmd->ld->topology)) {
 		json_notify_fmt(cmd, LOG_UNUSUAL,
-				"Waiting to sync with bitcoind network (block %u of %u)",
+				"Waiting to sync with palladiumd network (block %u of %u)",
 				get_block_height(cmd->ld->topology),
 				get_network_blockheight(cmd->ld->topology));
 

lightningd/opening_control.c

@@ -1456,7 +1456,7 @@ static struct command_result *json_fundchannel_start(struct command *cmd,
 			= tal(cmd, struct fundchannel_start_info);
 
 		json_notify_fmt(cmd, LOG_UNUSUAL,
-				"Waiting to sync with bitcoind network (block %u of %u)",
+				"Waiting to sync with palladiumd network (block %u of %u)",
 				get_block_height(cmd->ld->topology),
 				get_network_blockheight(cmd->ld->topology));
 

lightningd/peer_htlcs.c

@@ -720,7 +720,7 @@ const u8 *send_htlc_out(const tal_t *ctx,
 	/* Note: we allow outgoing HTLCs before sync, for fast startup. */
 	if (!topology_synced(out->peer->ld->topology)) {
 		log_debug(out->log, "Sending HTLC while still syncing"
-			  " with bitcoin network (%u vs %u)",
+			  " with palladium network (%u vs %u)",
 			  get_block_height(out->peer->ld->topology),
 			  get_network_blockheight(out->peer->ld->topology));
 	}
@@ -2409,7 +2409,7 @@ void peer_got_commitsig(struct channel *channel, const u8 *msg)
 		return;
 	}
 
-	/* If we're not synced with bitcoin network, we can't accept
+	/* If we're not synced with palladium network, we can't accept
 	 * any new HTLCs.  We stall at this point, in the hope that it
 	 * won't take long! */
 	if (added && !topology_synced(ld->topology)) {