Significant work done porting to headless engine

procedural/src/engine/support/lakes_render.md

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+# Removed Rendering/UI Logic from lakes.js
+
+## Analysis Result: No Rendering Logic Found
+
+After careful analysis of the original `lakes.js` module, **no DOM manipulation or SVG rendering logic was found** that needed to be removed.
+
+## Original Code Analysis
+
+The original `lakes.js` module contained only:
+
+1. **Data Processing Functions:**
+   - `detectCloseLakes()` - Pure computational logic for lake classification
+   - `defineClimateData()` - Mathematical calculations for lake climate properties
+   - `cleanupLakeData()` - Data cleanup and filtering operations
+   - `getHeight()` - Mathematical calculation for lake elevation
+   - `getName()` - Name generation using external Names module
+
+2. **DOM Reads Only (No DOM Writes):**
+   - `byId("lakeElevationLimitOutput").value` - Configuration input (converted to config property)
+   - `heightExponentInput.value` - Configuration input (converted to config property)
+
+## No Removed Code Blocks
+
+There were **no code blocks removed** from the original module because:
+
+- No `d3.select()` calls for DOM/SVG manipulation
+- No `document.getElementById().innerHTML` assignments
+- No DOM element creation or modification
+- No SVG path generation or rendering
+- No UI notification calls (like `tip()`)
+- No direct DOM manipulation whatsoever
+
+## Conclusion
+
+The original `lakes.js` module was already focused purely on data processing and mathematical calculations. The only browser dependencies were:
+
+1. DOM reads for configuration (converted to config parameters)
+2. Access to global state variables (converted to dependency injection)
+3. External utility dependencies (converted to injected parameters)
+
+All refactoring work was focused on **dependency injection** and **config parameter extraction** rather than removing rendering logic, as none existed in the original code.