Update node to use Bitcoin Knots for improved flexibility

Switch to the Bitcoin Knots Docker image and adjust data directory paths and healthcheck commands in docker-compose.yml, lnd-init.sh, ops.sh, and setup.sh.

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infrastructure/docker-compose.yml

@@ -1,17 +1,21 @@
 services:
 
   bitcoin:
-    image: lncm/bitcoind:v27.0
+    # Bitcoin Knots — Luke Dashjr's fork of Core, stricter mempool policy
+    # Image is unofficial but built from reproducible Knots binaries (bitcoinknots.org)
+    # For max sovereignty: build from source and replace this image with your own
+    # To swap implementations: change image + datadir volume path, nothing else
+    image: bitcoinknots/bitcoin:29.3.knots20260210
     container_name: bitcoin
     restart: unless-stopped
     volumes:
-      - bitcoin_data:/data/.bitcoin
+      - bitcoin_data:/home/bitcoin/.bitcoin
     ports:
       - "8333:8333"
     networks:
       - node-net
     healthcheck:
-      test: ["CMD", "bitcoin-cli", "-conf=/data/.bitcoin/bitcoin.conf", "getblockchaininfo"]
+      test: ["CMD", "bitcoin-cli", "-datadir=/home/bitcoin/.bitcoin", "getblockchaininfo"]
       interval: 60s
       timeout: 10s
       retries: 5