Rename coolant to water

TASKS.md

@@ -8,7 +8,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
 - Existing tests cover older behavior. They are useful regression scaffolding, but they do not prove the latest design rules.
 - The simulation has a working `SimulationEngine`, network propagation, consumers, structural integrity, leaks, reactor readiness, forecasts, serialization, editor helpers, and Godot session bridge.
 - Godot currently has a usable UX scaffold and grid renderer, but it still exposes older interaction concepts such as a player-facing `EndTurn` action and always-available underground layer controls.
-- Existing campaign data is the older three-level placeholder set: `coolant_restart.json`, `fuel_bleed.json`, and `black_start.json`. These levels and manifest entries must be replaced by the tutorial plus six-group campaign from `docs/CAMPAIGN.md`.
+- Existing campaign data is the older three-level placeholder set: `water_restart.json`, `fuel_bleed.json`, and `black_start.json`. These levels and manifest entries must be replaced by the tutorial plus six-group campaign from `docs/CAMPAIGN.md`.
 - Unrelated Godot metadata or generated `.uid` files are not part of this backlog unless a later implementation task intentionally touches them.
 
 ## P0 Simulation Contract
@@ -27,34 +27,34 @@ This backlog tracks what must change so the implementation matches `docs/design.
   - Block intentional underground propagation across the authored branch boundary.
   - Preserve downstream starvation/readiness consequences for consumers and reactor feed.
   - Add editor placement, validation, serialization, and rendering support.
-- [ ] Add `SprinklerControlProp` and wall-mounted `CoolantSprinklerValve`.
-  - A `SprinklerControlProp` links to exactly one `CoolantSprinklerValve`.
+- [ ] Add `SprinklerControlProp` and wall-mounted `SprinklerValve`.
+  - A `SprinklerControlProp` links to exactly one `SprinklerValve`.
   - The valve is wall-mounted, not directly interactive, and has exactly one outlet/access floor face.
-  - Discharge creates `SprinklerWater` only while linked control is `Enabled` and the coolant branch is fed.
-  - Discharge applies deterministic local coolant pressure debt.
+  - Discharge creates `Water` only while linked control is `Enabled` and the water branch is fed.
+  - Discharge applies deterministic local water pressure debt.
   - Add editor placement/linking, validation, serialization, and rendering support.
-- [ ] Rework surface coolant into `SprinklerWater`.
-  - Rename code-facing concepts where practical; otherwise make names and UI text consistently mean sprinkler water, not a generic coolant hazard.
-  - `Coolant` pipe failures should inject `SprinklerWater`, not a second damaging liquid.
-  - `SprinklerWater` alone must not cause `UnsafeEntryLoss`.
+- [ ] Rework surface water into `Water`.
+  - Rename code-facing concepts where practical; otherwise make names and UI text consistently mean water, not a generic hazard.
+  - `water` pipe failures should inject `Water`, not a damaging liquid.
+  - `Water` alone must not cause `UnsafeEntryLoss`.
 - [ ] Update leak injection.
   - Leaks inject only when the underground leak cell has positive amount and positive pressure/voltage after propagation.
   - Isolating a leak stops fresh injection without repairing the underlying fault.
   - Repair restores structural integrity and stops future injection but does not clean existing surface values.
 - [ ] Implement the approved surface interaction order.
   - Resolve leak/sprinkler injection per `Step`.
-  - Resolve coolant mitigation before ignition and electrical spread.
+  - Resolve water mitigation before ignition and electrical spread.
   - Implement `Dilute`, `Quench`, value-based `Evaporate`, wet-electric `Conduct`, and `Ignite`.
   - Preserve deterministic same-cell and adjacent-cell delta accumulation.
   - Closed powered doors and remedy blocks must gate only the interactions they explicitly block.
 - [ ] Implement value-based evaporation.
   - Add balance values for ambient evaporation, heat-driven evaporation, and evaporation cooling.
-  - Hot cells should evaporate `SprinklerWater` faster than cold cells.
+  - Hot cells should evaporate `Water` faster than cold cells.
   - Evaporation happens during useful action pulses; there is no campaign wait command.
 - [ ] Implement `Unsafe` as derived movement safety.
   - `Unsafe` is recalculated after authored setup and after each `Pulse`.
   - `Unsafe` is caused by unsafe `Heat`, unsafe `LeakedElectricity`, or the wet-electric unsafe rule.
-  - `LeakedFuel` alone and `SprinklerWater` alone are not `Unsafe`.
+  - `LeakedFuel` alone and `Water` alone are not `Unsafe`.
   - `UnsafeEntryLoss` happens only when `MoveRobot` enters an `Unsafe` destination without applicable protection.
   - A `Pulse` must not kill a stationary robot just because the current cell becomes `Unsafe`.
 - [ ] Implement powered prop behavior.
@@ -72,7 +72,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
 
 ## P0 Simulation Tests
 
-- [ ] Update existing tests so their names and assertions use `Pulse`, `Step`, `SprinklerWater`, `Unsafe`, and `ReactorReadiness` terminology.
+- [ ] Update existing tests so their names and assertions use `Pulse`, `Step`, `Water`, `Unsafe`, and `ReactorReadiness` terminology.
 - [ ] Add tests for fixed pulse length.
   - Every accepted `LengthyAction` advances one `Pulse`.
   - Each pulse resolves the configured number of `Step`s.
@@ -84,18 +84,18 @@ This backlog tracks what must change so the implementation matches `docs/design.
   - Open valve allows branch propagation.
   - Closed valve isolates damaged branches and can starve downstream consumers/reactor feed.
   - Toggling a valve triggers exactly one `Pulse`.
-- [ ] Add tests for `SprinklerControlProp` and `CoolantSprinklerValve`.
-  - Valve discharge requires a linked enabled control and fed coolant branch.
+- [ ] Add tests for `SprinklerControlProp` and `SprinklerValve`.
+  - Valve discharge requires a linked enabled control and fed water branch.
   - Direct valve interaction is invalid or unavailable.
-  - Discharge creates `SprinklerWater` at the authored outlet and applies pressure debt.
+  - Discharge creates `Water` at the authored outlet and applies pressure debt.
   - Disabling the linked control or isolating the sprinkler branch stops fresh discharge.
 - [ ] Add tests for updated leak injection.
-  - Fed fuel, coolant, and electricity leaks inject to the correct access face.
+  - Fed fuel, water, and electricity leaks inject to the correct access face.
   - Isolated leaks stop new surface injection.
   - Repairs restore structural integrity without cleaning existing surface values.
 - [ ] Add tests for surface interactions.
-  - `SprinklerWater` dilutes `LeakedFuel`.
-  - `SprinklerWater` quenches `Heat`.
+  - `Water` dilutes `LeakedFuel`.
+  - `Water` quenches `Heat`.
   - Evaporation removes water and cools heat according to balance values.
   - Wet cells conduct electricity faster than dry cells.
   - Fuel plus electricity or heat can ignite and create heat while consuming fuel.
@@ -126,7 +126,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
 - [ ] Update serialization round trips for new fields.
   - `IsolationValveProp` carrier and open/closed state.
   - `SprinklerControlProp` enabled/disabled state and linked valve id or position.
-  - `CoolantSprinklerValve` wall position, outlet/access face, linked control, and coolant connection.
+  - `SprinklerValve` wall position, outlet/access face, linked control, and water connection.
   - Powered terminal active state if it becomes serialized runtime state.
 - [ ] Update `LevelEditor` tools.
   - Add isolation valve placement.
@@ -137,7 +137,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
 - [ ] Update `LevelValidator`.
   - Validate powered doors have valid geometry and local electricity.
   - Validate terminal power requirements where needed.
-  - Validate wall-mounted sprinkler valve geometry, outlet/access face, coolant connection, and exactly one linked control.
+  - Validate wall-mounted sprinkler valve geometry, outlet/access face, water connection, and exactly one linked control.
   - Validate isolation valves sit on exactly one matching underground carrier.
   - Warn on initially unready reactors, initially starved required consumers, unused supplies, and sprinkler valves with no useful suppression or pressure tradeoff.
 - [ ] Replace placeholder campaign files.
@@ -167,7 +167,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
   - Show why terminal access is unavailable when unpowered or away from the terminal.
   - Use `Pulse +N` wording in forecast UI.
 - [ ] Update grid rendering and inspector text.
-  - Render `SprinklerWater` separately from underground `Coolant`.
+  - Render `Water` separately from underground `water`.
   - Render `Unsafe` cells with a distinct movement warning treatment.
   - Render isolation valve state, sprinkler control state, wall-mounted sprinkler outlet, powered door state, and powered terminal state.
   - Inspector should display visible surface values, prop state, consumer per-carrier state, and underground values only when terminal access allows it.
@@ -182,7 +182,7 @@ This backlog tracks what must change so the implementation matches `docs/design.
 - [ ] Add campaign completion flow for the final Group 6 level.
 - [ ] Add loading and malformed-level error states for campaign level loading.
 - [ ] Verify Win2D editor export and Godot loader compatibility for the new schema.
-- [ ] Revisit art labels/icons for `SprinklerWater`, `Unsafe`, powered props, and sprinkler controls after mechanics are implemented.
+- [ ] Revisit art labels/icons for `Water`, `Unsafe`, powered props, and sprinkler controls after mechanics are implemented.
 
 ## Verification Rules