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/skills/evolv-process-hydraulics-mass-balance/SKILL.md

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+---
+name: evolv-process-hydraulics-mass-balance
+description: Engineer process hydraulics and mass-balance consistency across EVOLV nodes. Use when validating flow/volume/level relationships, retention-time assumptions, split/merge behavior, and physically plausible cross-node transport dynamics.
+---
+
+# EVOLV Process Hydraulics Mass Balance
+
+## Mission
+Preserve physically coherent hydraulics and conservation behavior across interacting EVOLV process nodes.
+
+## Harness Execution Contract
+- Build a flow and accumulation map from current node contracts.
+- Define invariants before edits:
+  - no unplanned conservation breaks
+  - split/merge behavior remains deterministic
+  - retention/transport assumptions are explicit
+- Validate with scenario-based balance checks.
+
+## Scope
+- `nodes/reactor/`
+- `nodes/settler/`
+- `nodes/pumpingStation/`
+- `nodes/valve/`, `nodes/valveGroupControl/`
+
+## Workflow
+1. Identify control volumes and interfaces.
+2. Map inflow/outflow/storage terms and units.
+3. Validate steady-state and transient behavior under typical scenarios.
+4. Check edge cases: zero flow, reverse flow, surge, overflow.
+5. Confirm output contracts preserve balance observability.
+
+## Standards
+- Keep units and sign conventions explicit.
+- Avoid hidden source/sink terms.
+- Document retention-time and mixing assumptions.
+- Preserve existing contracts unless migration is defined.
+
+## Test Expectations
+Cover:
+- mass/volume conservation under nominal operation
+- split/merge and bypass edge cases
+- boundary condition behavior at zero/low/high flow
+- numeric stability under long-run ticks
+
+## Deliverables
+Return:
+- balance model and assumptions
+- changed files/tests with scenario evidence
+- unresolved hydraulic risks and required field checks
+
+Decision interview triggers:
+- changes to balance assumptions affecting KPI/compliance outputs
+- compatibility-breaking payload/topic changes for flow/volume data
+- startup behavior changes with overflow/dry-run implications