# Reactor Maintenance Rewrite Tasks

## Current State

- Branch: `design-rewrite`
- Scope approved: implement `docs/design.md` end-to-end with deterministic defaults and no backward compatibility.
- Simulation core has been replaced with the first design-native model and deterministic engine slice.
- Simulation and test projects now target `net10.0` because this Linux environment only has the .NET 10 runtime.
- Win2D editor has been rewritten against the new design model.
- Win2D project now targets `net10.0-windows10.0.19041.0` to match the simulation project.
- Linux can restore and compile the referenced simulation project, but full WinUI/XAML compilation still requires a Windows-capable XAML compiler environment.

## Completed Work

- Read project instructions, Linux instructions, code style, and `docs/design.md`.
- Confirmed deterministic balance defaults should be chosen during implementation.
- Confirmed a full Win2D editor is required.
- Created branch `design-rewrite`.
- Added `TASKS.md` as the required per-commit work tracker.
- Removed the legacy integer hazard/effect/hazard plug-in simulation surface.
- Added design-native terrain, underground carrier layers, surface hazards, props, leaks, doors, reactor bindings, robot inventory, rule events, validation, serialization, and forecasts.
- Added deterministic default balancing values.
- Added a first deterministic simulation pipeline for network propagation, consumers, leaks, surface interactions, robot safety, reactor readiness, rule events, and forecasts.
- Replaced old tests with design-based simulation tests.
- Verified `dotnet test tests/ReactorMaintenance.Simulation.Tests/ReactorMaintenance.Simulation.Tests.csproj` passes: 11 passed.
- Attempted `dotnet jb cleanupcode --build=False ...`; unavailable in this environment because `dotnet-jb` is not installed.
- Reviewed the first slice and fixed an action-resolution maintainability issue before commit.
- Verified `git diff --check` reports no whitespace errors.
- Ran `dotnet jb cleanupcode --build=False ...` successfully after ReSharper install and normalized line endings back to LF.
- Reworked the Win2D editor for the new model: full tool list, layer-aware painting, terrain, underground carriers, surface hazards, props, doors, leaks, robot, forecasts, save validation, starter level, and simple play actions.
- Removed old editor dependencies on legacy props, pressure pipes, smoke, fire, and global power/cooling/core-stability fields.
- Verified `dotnet test tests/ReactorMaintenance.Simulation.Tests/ReactorMaintenance.Simulation.Tests.csproj` passes after the editor rewrite: 11 passed.
- Attempted Win2D build on Linux with `dotnet build src/ReactorMaintenance.Win2D/ReactorMaintenance.Win2D.csproj -p:EnableWindowsTargeting=true -p:Platform=x64`; it fails at Windows `XamlCompiler.exe` with exec format error.
- Attempted managed XAML compiler path with `-p:UseXamlCompilerExecutable=false`; it fails loading the WinUI XAML compiler task dependency under this Linux/.NET 10 setup.
- Updated `README.md` for the new design-model editor, .NET 10 target, and Linux/Windows build expectations.
- Committed the Win2D editor rewrite slice.
- Added branch-aware junction flow analysis shared by validation and simulation propagation.
- Junction validation now rejects malformed branch counts and ambiguous source-side branches.
- Junction propagation now applies deterministic T-junction and cross-junction ratio weights only to inferred outgoing branches.
- Added tests for T-junction ratio splits, zero-weight branches, ambiguous junction validation, and best-path flow into non-junction cells.
- Verified `dotnet test tests/ReactorMaintenance.Simulation.Tests/ReactorMaintenance.Simulation.Tests.csproj` passes: 15 passed.
- Ran `jb cleanupcode --build=False ...` and `python D:\Code\crlf.py ...` for touched C# files after the junction slice.
- Expanded rule predicates with reactor readiness/loss/win, network value bands, and robot inventory checks.
- Expanded rule effects with removal of surface hazards, heat, and inventory, plus authored access positions for leak-start effects.
- Hardened rule event validation for predicate targets, effect targets, leak access, and non-negative amount effects.
- Added tests for network-band rules, reactor-ready rules, inventory rules, removal effects, electricity leak access, and invalid rule targets.
- Verified `dotnet test tests/ReactorMaintenance.Simulation.Tests/ReactorMaintenance.Simulation.Tests.csproj` passes after the rule slice: 21 passed.
- Ran `jb cleanupcode --build=False ...` and `python D:\Code\crlf.py ...` for touched C# files after the rule slice.
- Split serializable simulation records and enums from the monolithic `Models.cs` file into individual files under `Models`.
- Moved level creation, grid mutation helpers, surface clamping, grid geometry, and inventory operations out of serializable model records.
- Replaced separate T-junction and cross-junction props/tools with one topology-inferred `Junction` prop and one editor tool.
- Moved junction ratio presets into balancing data.
- Replaced hardcoded `EPairEffect` variants with parameterized surface interaction verbs and balance-owned magnitudes.
- Temporarily introduced and then removed a public `SimulationEngine` facade after review showed it was pure delegation.
- Updated design documentation for generic junctions and parameterized surface interactions.
- Removed the temporary `SimulationCoreSystem` catch-all and made `SimulationEngine` the real orchestration point.
- Split simulation behavior into purposeful systems for player actions, network propagation, consumers, leaks, surface interactions, robot safety, reactors, rule events, and forecasts.
- Kept `Systems` limited to behavior-owning systems; shared traversal, band, and carrier math helpers live at the simulation root.
- Replaced carrier-specific editor enum entries with parameterized editor commands.
- Added explicit editor workflows for door edge selection, electricity wall leak access-face selection, reactor consumer binding, and basic rule event authoring.
- Added editor operation tests plus broader junction validation and serialization round-trip coverage.
- Verified `dotnet test tests\ReactorMaintenance.Simulation.Tests\ReactorMaintenance.Simulation.Tests.csproj` passes: 27 passed.
- Verified `dotnet build src\ReactorMaintenance.Win2D\ReactorMaintenance.Win2D.csproj -p:Platform=x64 -p:EnableWindowsTargeting=true` succeeds on Windows.
- Ran `jb cleanupcode --build=False ...` and `python D:\Code\crlf.py ...` for touched files in the final rewrite slice.

## Current Work

- Rewrite task list completed on `design-rewrite`.

## Future Work

No known rewrite tasks remain.