## Stack Context
Part 3 (top) of a 3-PR stack moving memory deduplication into the SDKs. See `sdk-dedup/tools-ts` for full context.
## What?
Update the SDK playground so its debug view reflects the SDK-owned memory block.
- Displays the current deduplicated `<supermemory>` replacement block produced by the SDK middleware, instead of the old browser-side "seen facts" delta.
- Adds a `memory-dedupe` helper and ignores local `*.tsbuildinfo`.
## Why?
The previous debug cards were misleading — they showed an incremental browser-filtered delta while the middleware actually re-injected the full profile. Now the visualization matches what the SDK really sends.
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<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Playground-only visualization and chat gating changes; no production SDK or API behavior.
>
> **Overview**
> The playground **debug trace** now shows the **deduplicated memory block** the SDK middleware would inject (static → dynamic → search, mode-aware), instead of a misleading browser-side “new facts” delta. A new **`memory-dedupe`** helper mirrors `@supermemory/tools` middleware behavior and is applied when fetching container context and building middleware memory debug entries; the context preview card is relabeled to reflect that each turn **replaces** the prior `<supermemory>` block.
>
> **Chat UX:** messaging is enabled when API keys are configured on the **server** (`hasSupermemoryKey` / `hasOpenAiKey` from `/api/chat`), not only when keys are typed in the panel. The message input stays editable while waiting for text; Send still requires non-empty input.
>
> Also ignores `*.tsbuildinfo` in `.gitignore`.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit ed15364eb3. Bugbot is set up for automated code reviews on this repo. Configure [here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
## Summary
- Add `apps/sdk-playground` — chat UI to test TS/Python SDK integrations
- Context panel with document memories, API keys in dashboard, tools reference tab
- Python FastAPI server on port 8792; portless entry in `portless.json`
Stacked on #1436
## Test plan
- [ ] `cd apps/sdk-playground && bun run check-types`
- [ ] `bun run dev` with Supermemory + OpenAI keys in UI
- [ ] Switch SDKs and verify chat + context panel
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