deno-libs / gql / 21184994341

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add async context initialization support

Implements #23 - support for asynchronous context initialization.

The reqCtx parameter now accepts functions that return either ReqCtx or
Promise<ReqCtx>, allowing async operations like database queries,
authentication checks, or API calls during context creation.

Changes:
- Update reqCtx type signature to support async functions
- Add await for reqCtx invocation in handleRequest
- Add comprehensive tests for async context functionality
- Add example demonstrating async auth context pattern
- Update documentation in README and CLAUDE.md

This is backwards compatible - existing synchronous context functions
continue to work without changes.

Closes #23

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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