# D.5.3a — Selected-object meter — implementation plan

Spec: `docs/superpowers/specs/2026-06-18-d53a-selected-object-meter-design.md`.
Pre-approved by user 2026-06-18; subagent-driven, sequential (build-safe in one worktree).

Mandatory per task: cite named-retail anchors in comments; `dotnet build` + the relevant
`dotnet test` green; match surrounding code style. No commits by subagents — the lead commits the
coherent set after the full build+test passes.

## Task order (each builds on the accumulated working tree)

### T1 — `WorldSession.SendQueryHealth` (+ net test)  · project: `AcDream.Core.Net`
- Add `SendQueryHealth(uint targetGuid)` mirroring `SendChangeCombatMode` (`WorldSession.cs:1134`):
  `NextGameActionSequence()` → `SocialActions.BuildQueryHealth(seq, guid)` → `SendGameAction(body)`.
- Test in `tests/AcDream.Core.Net.Tests/`: drive it through the existing send-capture seam used by the
  other `WorldSession.Send*` tests; assert captured bytes == `BuildQueryHealth(seq, guid)`.
- Accept: `dotnet test` for `AcDream.Core.Net.Tests` green.

### T2 — `DatWidgetFactory.BuildMeter` single-image shape (+ test)  · project: `AcDream.App`
- Handle `containers.Count == 1`: `BackLeft = info.StateMedia[""].File`,
  `FrontLeft = containers[0].StateMedia[""].File`, tile/right = 0. Keep `>= 2` (vitals) path unchanged.
  Warn only on `Count == 0` / `Count > 2`.
- Extend `tests/AcDream.App.Tests/UI/Layout/DatWidgetFactoryTests.cs`: 1-container synthetic meter
  asserts Back/Front populated + others 0; 2-container case asserts vitals path unchanged.
- Accept: `dotnet test` for `AcDream.App.Tests` green.

### T3 — `SelectedObjectController` (+ test)  · project: `AcDream.App`
- New `src/AcDream.App/UI/Layout/SelectedObjectController.cs` per spec §3 (Bind signature, bind-time
  setup, `OnSelectionChanged` clear-then-populate). Cite `HandleSelectionChanged:198635`.
- New `tests/AcDream.App.Tests/UI/Layout/SelectedObjectControllerTests.cs` per spec §Testing item 2
  (mirror `ToolbarControllerTests` for building a minimal `ImportedLayout` + recording delegates).
- Accept: `dotnet test` for `AcDream.App.Tests` green.

### T4 — GameWindow integration + register rows  · project: `AcDream.App`  (depends on T1, T3)
- Convert `_selectedGuid` field → `SelectedGuid` property + `SelectionChanged` event (spec §1); replace
  the 3 write sites; leave read sites on the field.
- Remove `0x100001A1` + `0x100001A2` from `ToolbarController.HiddenIds` (keep `0x100001A4`).
- Wire `SelectedObjectController.Bind(...)` after `ToolbarController.Bind` (spec §5).
- Add the 2 divergence rows (spec §Divergence) to
  `docs/architecture/retail-divergence-register.md`.
- Accept: full `dotnet build` + `dotnet test` green.

## Then (lead)
- Adversarial Opus review of the full diff vs spec + decomp.
- Commit the coherent set to the branch; update roadmap/ISSUES if applicable; memory if a durable lesson.
- Stop for the user's visual gate (the acceptance test for this stream).