docs(ui): task-detail island redesign spec + component build prompts

docs/superpowers/plans/2026-06-04-task-detail-redesign-prompts.md

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+# Task Detail Redesign — Component Build Prompts
+
+Three isolated build tasks (one per component). Each runs in its own worktree off
+`main`, with the project CLAUDE.md auto-loaded. Full design context lives in
+`docs/superpowers/specs/2026-06-04-task-detail-redesign-design.md` — every task
+must read it first.
+
+Shared rules (all three):
+- Build a **standalone** `UserControl` + dedicated `ViewModel` that renders fully
+  in the Avalonia previewer via **design-time sample data** (parameterless ctor
+  populating realistic values). Do **not** bind to `DetailsIslandViewModel`.
+- New files under `src/ClaudeDo.Ui/Views/Islands/Detail/` and
+  `src/ClaudeDo.Ui/ViewModels/Islands/Detail/`.
+- Use **only** tokens from `Design/Tokens.axaml` and classes from
+  `Design/IslandStyles.axaml`. No inline hex, no magic numbers where a token
+  exists. `PathIcon` fills geometry — stroke-only art is invisible.
+- Compiled bindings (`x:DataType`). MVVM via CommunityToolkit
+  (`[ObservableProperty]`, `[RelayCommand]`); VM inherits `ViewModelBase`.
+- **Do NOT modify** `DetailsIslandView.axaml`, `DetailsIslandViewModel.cs`,
+  `AgentStripView`, `SessionTerminalView`, or `TaskRunner.cs`.
+- Verify: `dotnet build src/ClaudeDo.Ui/ClaudeDo.Ui.csproj -c Release` is green.
+  Stage files explicitly by path (never `git add -A`). Commit with a conventional
+  message.
+
+---
+
+## TASK 1 — TaskHeaderBar
+
+(prompt text = task description; see below)
+
+## TASK 2 — DescriptionStepsCard
+
+## TASK 3 — WorkConsole