feat: add Expo SDK 57 support

[MrAdex77]

Closes #38

Summary

Upgrades the example app to Expo SDK 57 (React Native 0.86, React 19.2) and validates the library, config plugin, and docs against it. RN 0.86 has no user-facing breaking changes from 0.85, so this is dependency alignment plus verification — no library source changes were required.

• chore(example): expo ~57.0.6, react-native 0.86.0, expo-status-bar, babel-preset-expo, reanimated 4.5 + worklets 0.10 per the SDK 57 recommended set; react stays 19.2.3, nitro stays on the 0.35 line (already RN 0.86 compatible)
• chore(deps): @expo/config-plugins devDependency to ~57.0.0 so the plugin typechecks and unit-tests against the SDK 57 prebuild toolchain; react-native devDependency to 0.86.0
• docs: supported range stated as SDK 56+ (verified through SDK 57) with matching RN versions in expo-setup prerequisites, README requirements, and the architecture table

Breaking change

None. Published peerDependencies are unchanged — the existing ranges (react-native >=0.78.0, react-native-nitro-modules >=0.35.0) already cover RN 0.86, so current consumers are unaffected.

Test plan

• bun run nitrogen, bun run lint, bun run typecheck, bun run build, library tests — all green
• npx expo-doctor in example/ — passes (one pre-existing false positive, see Notes)
• expo prebuild --clean output diffed against an SDK 56 baseline: plugin-injected surface identical — com.google.android.geo.API_KEY meta-data, ACCESS_FINE_LOCATION/ACCESS_COARSE_LOCATION, GoogleMapsIosApiKey, NSLocationWhenInUseUsageDescription; only manifest delta is the SDK 57 template adding assetsPaths to configChanges
• Example app development build runs on the latest iOS simulator (Xcode 26.6)
• Example app development build runs on a Pixel 9a emulator (Android 16)

Notes

• newArchEnabled was removed from example/app.json because the SDK 57 config schema rejects the property (the New Architecture is the only option now); the New Architecture itself is unaffected
• expo-doctor reports one pre-existing false positive ("app.json file ... app.config.js is not using the values from it") — the heuristic cannot see the require('./app.json') spread in app.config.js; npx expo config --json resolves all app.json values correctly, so the config structure was left as-is
• Bare RN 0.86 template moves the Android toolchain to compileSdk/targetSdk 36, Kotlin 2.1.20; the library compiles against the app-provided rootProject.ext values, so its gradle.properties fallbacks are intentionally untouched (they were aligned with the nitro-modules prefab in fix(android): align SDK versions with nitro-modules prefab #41)
• Nitro 0.36 exists but is not required for RN 0.86; staying on 0.35.x keeps this PR scoped to SDK support
• Building the example for iOS on SDK 57 requires macOS 26 and Xcode 26.6 — earlier Xcode 26.x fails compiling expo-modules-jsi@57.0.3 (expo-modules-jsi: abs(milliseconds) fails to compile with Swift 6 (Xcode 26) expo/expo#47843)

[coderabbitai]

📝 Walkthrough

Walkthrough

The example app is upgraded to Expo SDK 57 and React Native 0.86. Setup documentation now covers SDK 56+ through SDK 57, updated React Native prerequisites, and Nitro Modules. README and architecture references are updated accordingly.

Changes

Expo SDK 57 support

Layer / File(s)	Summary
Example app SDK and dependency upgrade example/package.json, package/package.json, example/app.json	Example dependencies and development dependencies are upgraded for Expo SDK 57 and React Native 0.86, and newArchEnabled is removed from the Expo configuration.
Expo setup prerequisites and verification docs/expo-setup.md, README.md	Documentation specifies SDK 56+ support verified through SDK 57, development-build requirements, React Native prerequisites, Nitro Modules, and SDK-to-RN mappings.
Architecture version reference docs/architecture.md	The example app technology choice is updated from Expo SDK 56 to SDK 57.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: jkasprzyk17, piotr-graczyk-dev

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR upgrades the example to SDK 57, updates docs and deps, and preserves the plugin behavior expected by #38.
Out of Scope Changes check	✅ Passed	No unrelated changes stand out; the edits are all tied to the SDK 57 support work.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Security Check	✅ Passed	No medium/high vulnerability found: the PR only updates docs and Expo/RN dependency alignment, with no new attacker-controlled sink or auth boundary change.
Title check	✅ Passed	The title is concise, uses a feat prefix, and clearly matches the Expo SDK 57 support update.
Description check	✅ Passed	The description directly describes the Expo SDK 57 upgrade, dependency alignment, and docs updates in this change.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@package/package.json`:
- Line 84: Move `@expo/config-plugins` from devDependencies to dependencies in
package/package.json so the published plugin has it available at runtime for
imports from package/plugin/src/index.ts and related plugin code.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 728c6d3d-5ede-47cf-9f57-f094de8a05be

📥 Commits

Reviewing files that changed from the base of the PR and between bf4184c and dbae23f.

⛔ Files ignored due to path filters (1)

• bun.lock is excluded by !**/*.lock

📒 Files selected for processing (6)

• README.md
• docs/architecture.md
• docs/expo-setup.md
• example/app.json
• example/package.json
• package/package.json

💤 Files with no reviewable changes (1)

• example/app.json

[jkasprzyk17]

Nice work 🫶 LGTM

SDK 57 / RN 0.86 upgrade looks clean, peer ranges already cover it, and the docs updates match. The CodeRabbit note about moving @expo/config-plugins into dependencies is a false positive (Expo plugins shouldn't ship that as a runtime dep).

Good job on the verification notes too (prebuild diff, device/emulator checks, Xcode caveat).