feat: add @lazarv/rsc package and migrate RSC serialization to bundler-agnostic API

[lazarv]

Summary

Introduces the new @lazarv/rsc package — a bundler-agnostic React Server Components (RSC) serialization and deserialization library — and migrates all internal RSC Flight protocol usage in @lazarv/react-server to use it.

New: @lazarv/rsc package (packages/rsc/)

A standalone package that wraps react-server-dom-webpack's Flight protocol behind a clean, bundler-agnostic API:

• @lazarv/rsc/server — renderToReadableStream() and prerenderToReadableStream() for server-side RSC serialization
• @lazarv/rsc/client — createFromReadableStream() and createFromFetch() for client-side RSC deserialization
• Uses a moduleResolver option pattern instead of requiring webpack-specific manifest objects
• Full TypeScript type definitions (types.d.ts)
• Comprehensive test suite (Flight protocol, streaming, references, error handling, cross-compat, edge cases, etc.)
• Vitest configuration with coverage reporting

Migration in @lazarv/react-server

RSC serialization (cache/rsc.mjs)

• Replaced direct react-server-dom-webpack/server.edge and client.edge imports with @lazarv/rsc/server and @lazarv/rsc/client
• Switched from passing a webpack manifest map as a positional argument to using the new moduleResolver option
• Removed the large createManifest() helper and its Proxy-based module map — no longer needed with the new API
• Simplified fromBuffer() and fromStream() to pass options directly
• rsc.mjs now works in both server and browser environments by gracefully handling absent clientReferenceMap

Console logger (client/error-overlay.mjs, lib/dev/logger-proxy.mjs)

• Replaced the complex pattern of monkey-patching React.__SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE and dynamically importing react-server-dom-webpack/server.browser with a direct import from @lazarv/rsc/server
• Significantly simplified the console-forwarding code in both error overlay and RSC worker logger proxy

Dev server (lib/dev/create-server.mjs)

• Replaced react-server-dom-webpack/client.edge import in handleClientConsole with @lazarv/rsc/client
• Removed the serverConsumerManifest option — no longer required

Storage cache (cache/storage-cache.mjs)

• Replaced Buffer.from().toString() calls with portable encodeBytes() / decodeBytes() helper functions using Uint8Array and btoa/atob for environments without Node.js Buffer

Logger improvements (lib/dev/create-logger.mjs)

• Improved format() usage to handle format-string patterns even without an Error argument
• Consolidated multi-line error logging into a single logger.error() call instead of one per line

use-cache plugin (lib/plugins/use-cache-inline.mjs)

• local and session cache providers now declare type: "rsc" in their options, enabling proper RSC serialization for browser-side caches
• The RSC serializer import is now conditional on whether any provider needs RSC serialization (hasRscProvider)

CI & Release

• All CI test jobs now also trigger on packages/rsc changes
• New test-rsc CI job runs pnpm test:coverage for the @lazarv/rsc package across Node 20/22/24 and multiple OS
• publish-commit.yml includes @lazarv/rsc in pkg-pr-new publish
• release-experimental.yml adds steps to publish @lazarv/rsc independently and update @lazarv/react-server's dependency on it

Tests

• New test: use cache browser component — validates RSC-serialized component caching in localStorage/sessionStorage with TTL expiration
• Updated RSC serialization assertion to match the new Flight format

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