Tag all remaining operational log lines with chain/protocol prefix

Additional tagged lines:
  [P2Pool] run_think(), think():best, Trimmed, Loaded shares, Requesting/Sending/Received shares
  [LTC] Pool block merkle_root validated, Block meets target, Peer reports height
  [LTC] Embedded broadcaster, Phase 4 embedded, Connecting to RPC

Startup/config messages left untagged (they're one-time, context is clear).
Runtime operational messages now all have [LTC]/[DOGE]/[P2Pool]/[Stratum]/[MM:X] prefix.

Author: frstrtr

src/c2pool/c2pool_refactored.cpp

@@ -990,7 +990,7 @@ int main(int argc, char* argv[]) {
             std::unique_ptr<ltc::coin::EmbeddedCoinNode> embedded_node;
 
             if (embedded_ltc) {
-                LOG_INFO << "Phase 4: embedded LTC coin node mode (no daemon required)";
+                LOG_INFO << "[LTC] Phase 4: embedded coin node mode (no daemon required)";
 
                 auto ltc_params = settings->m_testnet
                     ? ltc::coin::LTCChainParams::testnet()
@@ -1072,12 +1072,12 @@ int main(int argc, char* argv[]) {
                 embedded_broadcaster->set_on_peer_height(
                     [chain = embedded_chain.get()](uint32_t h) {
                         chain->set_peer_tip_height(h);
-                        LOG_INFO << "Peer reports chain height " << h
+                        LOG_INFO << "[LTC] Peer reports chain height " << h
                                  << " — fast-sync: scrypt skip below " << (h > 2100 ? h - 2100 : 0);
                     });
 
                 embedded_broadcaster->start();
-                LOG_INFO << "Embedded LTC broadcaster started, connecting to "
+                LOG_INFO << "[LTC] Embedded broadcaster started, connecting to "
                          << p2p_host << ":" << (coind_p2p_port > 0 ? coind_p2p_port : 19335);
                 // NOTE: set_on_new_headers and set_embedded_node are wired after web_server is created below
 
@@ -1089,7 +1089,7 @@ int main(int argc, char* argv[]) {
                 if (rpc_port == 19332 && !settings->m_testnet)
                     rpc_port = 9332; // mainnet LTC
 
-                LOG_INFO << "Connecting to coin daemon RPC at " << rpc_host << ":" << rpc_port;
+                LOG_INFO << "[LTC] Connecting to coin daemon RPC at " << rpc_host << ":" << rpc_port;
                 node_rpc->connect(NetService(rpc_host, static_cast<uint16_t>(rpc_port)),
                                   rpc_user + ":" + rpc_pass);
             }

src/core/web_server.cpp

@@ -3898,7 +3898,7 @@ nlohmann::json MiningInterface::mining_submit(const std::string& username, const
                             static uint256 s_last_submitted_prev;
                             if (prev_block != s_last_submitted_prev) {
                                 s_last_submitted_prev = prev_block;
-                                LOG_INFO << "Block meets blockchain target! Submitting to coin daemon";
+                                LOG_INFO << "[LTC] Block meets blockchain target! Submitting to coin daemon";
                                 submitblock(block_hex);
                             }
                         }
@@ -4161,7 +4161,7 @@ nlohmann::json MiningInterface::mining_submit(const std::string& username, const
                             static uint256 s_last_pool_submitted_prev;
                             if (prev_block != s_last_pool_submitted_prev) {
                                 s_last_pool_submitted_prev = prev_block;
-                                LOG_INFO << "Pool block merkle_root validated, submitting to coin daemon";
+                                LOG_INFO << "[LTC] Pool block merkle_root validated, submitting to coin daemon";
                                 submitblock(block_hex);
                             }
                         }

src/impl/ltc/node.cpp

@@ -366,7 +366,7 @@ std::vector<ltc::ShareType> NodeImpl::handle_get_share(std::vector<uint256> hash
 
 	if (!shares.empty())
 	{
-		LOG_INFO << "Sending " << shares.size() << " shares to " << peer_addr.to_string();
+		LOG_INFO << "[P2Pool] Sending " << shares.size() << " shares to " << peer_addr.to_string();
 	}
 	return shares;
 }
@@ -461,7 +461,7 @@ void NodeImpl::send_shares(peer_ptr peer, const std::vector<uint256>& share_hash
         peer->write(std::move(ftx_msg));
     }
 
-    LOG_INFO << "Sent " << shares.size() << " shares (+" << needed_txs.size()
+    LOG_INFO << "[P2Pool] Sent " << shares.size() << " shares (+" << needed_txs.size()
              << " txs) to " << peer->addr().to_string();
 }
 
@@ -526,7 +526,7 @@ void NodeImpl::download_shares(peer_ptr peer, const uint256& target_hash)
     std::vector<uint256> hashes = { target_hash };
     std::vector<uint256> stops;  // empty — don't stop early, let handle_get_share apply limits
 
-    LOG_INFO << "Requesting shares from " << peer->addr().to_string()
+    LOG_INFO << "[P2Pool] Requesting shares from " << peer->addr().to_string()
              << " starting at " << target_hash.ToString()
              << " (parents=" << PARENTS_PER_REQUEST << ")";
 
@@ -544,7 +544,7 @@ void NodeImpl::download_shares(peer_ptr peer, const uint256& target_hash)
                 return;
             }
 
-            LOG_INFO << "Received " << reply.m_items.size() << " shares for download request";
+            LOG_INFO << "[P2Pool] Received " << reply.m_items.size() << " shares for download request";
 
             // Feed into processing pipeline
             HandleSharesData data;
@@ -617,7 +617,7 @@ void NodeImpl::load_persisted_shares()
         }
     }
 
-    LOG_INFO << "Loaded " << loaded << " shares from LevelDB storage";
+    LOG_INFO << "[P2Pool] Loaded " << loaded << " shares from LevelDB storage";
 }
 
 void NodeImpl::start_outbound_connections()
@@ -674,7 +674,7 @@ void NodeImpl::run_think()
     if (m_think_running.exchange(true))
         return;
 
-    LOG_INFO << "run_think(): chain=" << m_tracker.chain.size()
+    LOG_INFO << "[P2Pool] run_think(): chain=" << m_tracker.chain.size()
              << " verified=" << m_tracker.verified.size()
              << " heads=" << m_tracker.chain.get_heads().size();
 
@@ -711,7 +711,7 @@ void NodeImpl::run_think()
                             total_removed += removed;
                         }
                         if (total_removed > 0)
-                            LOG_INFO << "Trimmed " << total_removed << " old shares from " << label
+                            LOG_INFO << "[P2Pool] Trimmed " << total_removed << " old shares from " << label
                                      << " (now " << sc.size() << ")";
                     };
                     trim_chain(m_tracker.verified, "verified", /*owns_data=*/false);
@@ -750,7 +750,7 @@ void NodeImpl::run_think()
                     // Update best share
                     if (!result.best.IsNull()) {
                         m_best_share_hash = result.best;
-                        LOG_INFO << "think(): best=" << result.best.GetHex().substr(0, 16) << "...";
+                        LOG_INFO << "[P2Pool] think(): best=" << result.best.GetHex().substr(0, 16) << "...";
                     } else {
                         LOG_WARNING << "think(): result.best is NULL — verified_tails="
                                     << m_tracker.verified.get_tails().size()