feat(playground-lynx): add a Lynx playground app

[V3RON]

Description

Adds apps/playground-lynx, a Lynx counterpart to apps/playground:

• Scaffolded with pnpm create rspeedy@latest (react-ts template) and adopted into the pnpm/Turborepo workspace (private, typecheck, lint).
• The generated template screen is replaced with a Rozenite splash: the gem mark rebuilt from its pixel rows (Lynx has no inline SVG element), styled with the same tokens apps/playground uses.
• Wires up Rozenite via @rozenite/lynx-dev (lynx.config.ts) and @rozenite/lynx (src/index.tsx).
• Installs every official plugin that declares lynx in its rozenite.config.ts integrations — Controls, Feature Flags, React Hook Form, TanStack Query — each with a minimal playground under src/plugins/.

Supporting changes: playground-lynx added to the commitlint scope enum and to the Changesets ignore list, matching how @rozenite/playground is handled.

Related Issue

None — this was requested directly, with no issue asked for.

Context

Rozenite's Lynx support already exists (packages/lynx, packages/lynx-dev), but nothing in the repository exercised it. This app gives that path a home the same way apps/playground does for React Native.

Plugin selection is not a judgement call made here: it is exactly the set that declares lynx in integrations. The remaining plugins depend on React Native or Metro internals and are deliberately not installed.

Two Lynx-specific shapes are worth flagging for review:

• The logo is a stack of view rows sized by pixel count rather than a 7×10 grid of blocks. Every row of the mark is a centred contiguous run, so widths reproduce it exactly with less markup.
• Lynx's input element is uncontrolled (no value prop), so the RHF field is driven through useController's field.onChange on bindinput. The field must be registered — with only setValue, the panel finds the form but reports no fields.

No version plan: nothing in a publishable package changed.

Testing

Automated, from the repository root after git fetch origin main:

• pnpm checks:affected — 107 tasks passed
• pnpm test:affected — 69 tasks passed
• pnpm --filter @rozenite/playground-lynx build — production build clean

Manual verification on the running iPhone 17 Pro simulator (agent-device), with the app loaded in LynxExplorer from pnpm --filter @rozenite/playground-lynx dev:

• The dev server discovered all 4 plugins and logged a DevTools URL as soon as LynxExplorer connected.
• Controls — pressed Increment in the panel; the device counter went 0 → 1.
• Feature Flags — toggled new-splash in the panel; the device value went true → false.
• React Hook Form — typed into the field on the device; the panel showed email = qa@lynx.dev, dirty and valid.
• TanStack Query — the ["lynx-demo"] query appeared in the panel.