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Introduces the pattern: basin model is the shared canvas (mode-agnostic physics); each control mode is its own page under wiki/modes/ plus a demand-vs-level transfer-function diagram under wiki/diagrams/modes/. - wiki/modes/README.md — index + per-mode page template (inputs, threshold policy, demand formula, edge cases, related) - wiki/modes/levelbased.md — first worked example using the new naming convention (dryRunLevel / minLevel / startLevel / maxLevel / overflowLevel). Forward-looking — the code still uses the old names until the pending rename refactor. - wiki/diagrams/modes/levelbased.drawio.svg — transfer-function plot (zones: STOP / DEAD ZONE / RAMP / SATURATE, safety trips outside the plot). Round-trippable via embedded drawio XML. - functional-description.md — replaced the inline levelbased/manual subsection with a table pointing at the modes/ pages. Removed the old control-zones ASCII diagram reference (superseded by the per-mode transfer function). - wiki/README.md — added Control modes entry + diagrams/modes/ pointer. The remaining placeholder modes (flowbased, pressureBased, percentageBased, powerBased, hybrid, manual) can each fill in the template independently. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>