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>

.agents/decisions/DECISION-20260223-pid-controller-placement-and-flowbased.md

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+# Decision: Shared Modern PID in generalFunctions + PumpingStation Flow-Based Adoption
+
+- Date: 2026-02-23
+- Scope: `nodes/generalFunctions/src/pid/*`, `nodes/pumpingStation/src/*`
+
+## Context
+Flow-based control in `pumpingStation` needed a production-grade PID with freeze/unfreeze, runtime retuning, and support for cascade/secondary-loop architecture.
+
+## Options Considered
+1. Implement PID only inside `pumpingStation`.
+2. Implement shared PID in `generalFunctions` and consume it from `pumpingStation`.
+3. Keep current heuristic (non-PID) flow controller.
+
+## Decision
+Chose option 2.
+
+## Rationale
+- PID behavior is cross-domain control functionality and should be reusable across EVOLV nodes.
+- `generalFunctions` already serves as shared utility/runtime infrastructure.
+- Reuse reduces drift and duplicated control logic.
+- PumpingStation can immediately adopt shared PID while preserving existing topic contracts.
+
+## Consequences
+- Positive:
+  - Single, test-covered PID implementation with modern features.
+  - PumpingStation flow mode becomes true closed-loop control.
+  - Runtime support for freeze/unfreeze and tuning updates without redeploy.
+- Risks:
+  - Behavioral differences versus prior heuristic flow control.
+  - Requires conservative tuning per site.
+
+## Safety / Compatibility
+- No existing topic names were removed.
+- Added optional control topics for PID runtime management.
+- Existing non-flowbased modes remain intact.
+
+## Rollback
+- Revert `nodes/pumpingStation/src/specificClass.js` flow-based branch to previous heuristic logic.
+- Keep shared PID module in `generalFunctions` for future use, or revert `nodes/generalFunctions/src/pid/*` if required.
+
+## Migration Notes
+- For `flowbased`, start with low `kp/ki`, verify stability in commissioning, then tune upward.
+- Use `freezeFlowPid` and `setFlowPidMode` during maintenance or manual takeover.