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>

.claude/rules/general-functions.md

@@ -0,0 +1,32 @@
+---
+paths:
+  - "nodes/generalFunctions/**"
+---
+
+# General Functions Rules
+
+## Critical: Platform-Wide Impact
+generalFunctions is shared by ALL 13 nodes. Any change here can break any node.
+
+## Before Modifying
+1. Identify which module(s) you're changing
+2. Search for imports across all `nodes/*/src/` directories
+3. List all consuming nodes
+4. Verify backward compatibility
+
+## Export Stability
+- Never remove or rename exports without checking all consumers
+- Prefer additive changes (new exports) over breaking changes
+- If a breaking change is necessary, it requires a decision-gate interview
+
+## Canonical Units
+MeasurementContainer and internal processing use canonical units:
+- Pressure: Pa
+- Flow: m³/s
+- Power: W
+- Temperature: K
+
+Unit conversions happen at system boundaries (input/output), not in core logic.
+
+## Testing After Changes
+Run tests in ALL affected consumer nodes, not just generalFunctions itself.