docs(interactive): spec + plan for in-app interactive sessions

Replace the external wt.exe 'Run interactively' launch with an in-app
streaming chat (persistent claude --input-format stream-json), rendered in
the shared SessionTerminalView in task detail and Mission Control. Autonomous
task execution is untouched. Mid-turn interrupt+redirect verified against CLI
2.1.191 via spike.

docs/superpowers/plans/2026-06-26-in-app-interactive-sessions.md

@@ -0,0 +1,101 @@
+# Plan — In-App Interactive Sessions
+
+Spec: `docs/superpowers/specs/2026-06-26-in-app-interactive-sessions-design.md`
+
+Implement on the shared main tree. Commit explicit paths per task (never `git add -A`).
+Build with `-c Release` (running Worker locks Debug). No real-Claude tests — fake the
+process stream. Sonnet subagents. Autonomous `TaskRunner`/`ClaudeProcess` path stays untouched.
+
+## Task 1 — StreamingClaudeSession (worker, new file)
+- `Runner/StreamingClaudeSession.cs`: persistent `claude` process. Ctor takes resolved args,
+  working dir, seeded first prompt, a line callback, `WorkerConfig`. Reuse the
+  `ProcessStartInfo` shape + `MCP_TOOL_TIMEOUT="200000"` from `ClaudeProcess`.
+  - Keeps stdin open; sends the first prompt as a user-message JSON line (escape via
+    `JsonSerializer`).
+  - stdout/stderr read tasks → line callback; parse `result` events to track `IsTurnInFlight`.
+  - `SendUserMessageAsync(text, ct)` — enqueue/write a user-message JSON line; if
+    `IsTurnInFlight`, also `InterruptAsync`.
+  - `InterruptAsync(ct)` — write the control-protocol interrupt line; best-effort (swallow +
+    log on failure → queue fallback applies).
+  - `StopAsync` / `DisposeAsync` — close stdin, kill the tree, await exit.
+  - Injectable stream seam so a fake can drive it without a real `claude` binary.
+- Test: `StreamingClaudeSessionTests` (fake stream) — first message emitted; `result` flips
+  `IsTurnInFlight` off; a sent message produces a second turn; mid-turn send calls interrupt
+  then delivers; interrupt throw → delivered at natural turn end; stop kills.
+
+## Task 2 — LiveSessionRegistry (worker, new file)
+- `Runner/LiveSessionRegistry.cs`: singleton; `Register(taskId, StreamingClaudeSession)`,
+  `bool TryGet(taskId, out session)`, `Unregister(taskId)`, `Task StopAsync(taskId)`.
+- Test: register→get; unregister; second register stops+replaces; missing get returns false.
+
+## Task 3 — InteractiveSessionService (worker, new file)
+- `Planning/InteractiveSessionService.cs`: inject `IDbContextFactory`, `WorkerConfig`,
+  `ClaudeArgsBuilder` (or build args inline), `HubBroadcaster`, `LiveSessionRegistry`.
+  - `StartAsync(taskId, ct)`: resolve list working dir + seeded prompt (reuse the body of
+    `PlanningSessionManager.OpenInteractiveAsync` + `BuildInteractivePrompt`); build interactive
+    args (`--model PlanningAlias --permission-mode auto` + streaming flags); spawn the session
+    with a callback that does `HubBroadcaster.TaskMessage(taskId, "[stdout] " + line)`;
+    register; broadcast `InteractiveSessionStarted`. Reject if one is already live for the task.
+  - `SendAsync(taskId, text, ct)` → registry `TryGet` → `SendUserMessageAsync`.
+  - `StopAsync(taskId, ct)` → registry stop + `InteractiveSessionEnded`.
+- Move `OpenInteractiveAsync`/`BuildInteractivePrompt` out of `PlanningSessionManager` if it
+  reads cleaner (or call into it). Remove the `InteractiveLaunchContext` terminal coupling.
+- Test: `InteractiveSessionServiceTests` (fake session factory + fake broadcaster) — start
+  resolves dir, seeds prompt, registers, broadcasts started; missing working dir throws;
+  send routes; stop broadcasts ended.
+
+## Task 4 — Remove terminal interactive path (worker)
+- `Planning/Interfaces/ITerminalLauncher.cs` + `WindowsTerminalLauncher.cs`: delete
+  `LaunchInteractiveAsync`; remove `InteractiveLaunchContext` from `PlanningSessionContext.cs`.
+  Keep planning start/resume launches.
+- Fix any references; ensure the planning launcher tests still build.
+
+## Task 5 — Hub + Broadcaster + DI (worker)
+- `Hub/WorkerHub.cs`: re-point `OpenInteractiveTerminalAsync` to
+  `InteractiveSessionService.StartAsync` (drop `_launcher.LaunchInteractiveAsync`); add
+  `Task SendInteractiveMessage(taskId, text)`, `Task StopInteractiveSession(taskId)`
+  (+ optional `InterruptInteractiveSession`).
+- `Hub/HubBroadcaster.cs`: `InteractiveSessionStarted(taskId)`, `InteractiveSessionEnded(taskId)`.
+- `Program.cs`: register `LiveSessionRegistry` + `InteractiveSessionService` singletons.
+- Test: `WorkerHub` send routes to a fake service; start invokes the service.
+
+## Task 6 — UI client + fakes (ui)
+- `Services/Interfaces/IWorkerClient.cs` + `WorkerClient.cs`: `SendInteractiveMessageAsync(
+  taskId, text)`, `StopInteractiveSessionAsync(taskId)` (+ optional interrupt); events
+  `Action<string>? InteractiveSessionStartedEvent`, `InteractiveSessionEndedEvent` with
+  `On<...>` handlers. `OpenInteractiveTerminalAsync` keeps name/signature.
+- Update hand-rolled `IWorkerClient` fakes in **both** Ui.Tests and Worker.Tests.
+
+## Task 7 — StreamLineFormatter user bubble (ui)
+- Render `type:"user"` NDJSON events as `LogKind.User` (add the kind if missing).
+- Test: a `user` event yields a `LogKind.User` `LogLineViewModel` with the text.
+
+## Task 8 — Shared composer state on the session VMs (ui, hot files)
+- Add to `TaskMonitorViewModel` and `DetailsIslandViewModel` (factor a shared helper —
+  `InteractiveComposer` — to avoid duplication): `ComposerDraft`, `IsInteractiveLive`
+  (toggled by `InteractiveSessionStarted/Ended` for the subscribed task),
+  `SubmitComposerCommand` (CanExecute: non-empty draft && (`HasPendingQuestion` ||
+  `IsInteractiveLive`)). Route: pending question → existing `AnswerTaskQuestionAsync`; else →
+  `SendInteractiveMessageAsync`. Clear draft on submit; clear `IsInteractiveLive` on ended.
+- `MissionControlViewModel`: `EnsureMonitor(taskId)` on `InteractiveSessionStarted`.
+- Test: composer enabled while interactive-live; submit routes (chat vs answer) + clears;
+  ended clears live state.
+
+## Task 9 — SessionTerminalView composer (ui)
+- `Views/Islands/SessionTerminalView.axaml(.cs)`: optional composer docked bottom (styled
+  props `IsComposerVisible`, `ComposerText`, `SubmitCommand`, `ComposerPlaceholder`); TextBox
+  (Enter submits) + Send button. Reuse existing tokens (no inline values).
+- Bind it in `MonitorPaneView.axaml` and `DetailsIslandView.axaml` to each VM's composer
+  state. Fold the existing AskUser banner into the composer's "answering" state if it reads
+  cleaner; otherwise leave the banner and add the composer below.
+
+## Task 10 — Localization
+- `en.json` + `de.json`: `interactive.composer.placeholder`, `.send`, `.stop`, plus any
+  "session ended" notice. Keep parity (Localization.Tests).
+
+## Task 11 — Build + test + verify
+- Build App + Worker `-c Release`; run Worker.Tests, Ui.Tests, Localization.Tests.
+- Self-review diffs. **Manual smoke (real CLI) — flag to Mika:** (a) Run interactively opens
+  an in-app chat (no terminal) and streams; (b) sending a message mid-turn interrupts +
+  redirects; (c) stop kills the process; (d) session shows in both task detail and Mission
+  Control. Do not push.