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-20260224-unit-anchor-rollout-phase1-machinegroup-pumping-valves.md

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+# Decision: Unit-Anchor Rollout Phase 1 (MachineGroup, PumpingStation, Valve, ValveGroupControl)
+
+- Date: 2026-02-24
+- Scope:
+  - `nodes/machineGroupControl/src/nodeClass.js`
+  - `nodes/machineGroupControl/src/specificClass.js`
+  - `nodes/pumpingStation/src/nodeClass.js`
+  - `nodes/pumpingStation/src/specificClass.js`
+  - `nodes/valve/src/nodeClass.js`
+  - `nodes/valve/src/specificClass.js`
+  - `nodes/valveGroupControl/src/nodeClass.js`
+  - `nodes/valveGroupControl/src/specificClass.js`
+
+## Context
+After adopting canonical-unit anchoring in `rotatingMachine`, adjacent controller nodes still mixed local units, unitless writes, and implicit conversions. That left cross-node behavior sensitive to registration order and source-unit assumptions.
+
+## Decision
+1. Apply the same canonical storage policy per node:
+- internal storage in canonical units (`Pa`, `m3/s`, `W`, `K` where relevant),
+- preferred/output units for operator-facing status and output payloads.
+
+2. Enable strict measurement ingress discipline on migrated nodes:
+- `strictUnitValidation: true`,
+- `throwOnInvalidUnit: true`,
+- required unit for physically dimensional types (`flow`, `pressure`, `power`, `temperature`, and node-specific equivalents).
+
+3. Replace unitless runtime writes/reads with explicit-unit helpers in each node’s domain class, including child-machine/child-valve interactions.
+
+## Consequences
+- Cross-node calculations now run against a deterministic unit anchor in phase-1 nodes.
+- Status/output values remain in preferred/output units, while internal math stays canonical.
+- Legacy paths that send dimensional values without units now fail fast instead of silently coercing.
+
+## Rollback Notes
+- Revert the eight files listed in scope.
+- Restore previous `MeasurementContainer` initialization (non-canonical, non-strict behavior) in each node.
+- Remove helper-based explicit unit reads/writes and revert to prior direct chain usage.