Migrate to new Gitea instance (gitea.wbd-rd.nl)

- Update all submodule URLs from gitea.centraal.wbd-rd.nl to gitea.wbd-rd.nl
- Add settler as proper submodule in .gitmodules
- Add agent skills, function anchors, decisions, and improvements
- Add Docker configuration and scripts
- Add manuals and third_party docs
- Update .gitignore with secrets and build artifacts
- Remove stale .tgz build artifact

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/fix-kla.js

@@ -0,0 +1,25 @@
+const fs = require("fs");
+const flowPath = "docker/demo-flow.json";
+const flow = JSON.parse(fs.readFileSync(flowPath, "utf8"));
+
+let newFlow = flow.filter(n => n.id !== "demo_dbg_reactor_inspect");
+const reactor = newFlow.find(n => n.id === "demo_reactor");
+reactor.wires[0] = reactor.wires[0].filter(id => id !== "demo_dbg_reactor_inspect");
+
+reactor.kla = 70;
+
+newFlow.push({
+  id: "demo_dbg_reactor_inspect",
+  type: "function",
+  z: "demo_tab_treatment",
+  name: "Reactor State Inspector",
+  func: 'if (msg.topic !== "GridProfile") return null;\nconst p = msg.payload;\nif (!p || !p.grid) return null;\nconst now = Date.now();\nif (global.get("lastInspect") && now - global.get("lastInspect") < 5000) return null;\nglobal.set("lastInspect", now);\nconst profile = p.grid.map((row, i) => "cell" + i + "(" + (i*p.d_x).toFixed(0) + "m): NH4=" + row[3].toFixed(2) + " DO=" + row[0].toFixed(2));\nnode.warn("GRID: " + profile.join(" | "));\nreturn null;',
+  outputs: 1,
+  x: 840,
+  y: 320,
+  wires: [[]]
+});
+reactor.wires[0].push("demo_dbg_reactor_inspect");
+
+fs.writeFileSync(flowPath, JSON.stringify(newFlow, null, 2) + "\n");
+console.log("kla:", reactor.kla, "X_A_init:", reactor.X_A_init);