jedarden ace9b2b77f P7.5.a: Request ID middleware + X-Request-Id response header ...

Implemented axum middleware that generates a UUIDv7 per inbound request
with an 8-character hex prefix exposed as X-Request-Id response header.

- Added RequestId newtype wrapper for type-safe extension access
- request_id_middleware generates UUIDv7, hashes to 8-char hex ID
- Stores in Request extensions for handler access
- Preserves existing x-request-id header if present
- Wire into main router via middleware layer

Acceptance:
- Every response includes X-Request-Id: <8-char hex>
- Request.extensions().get::<RequestId>() works from handlers
- Unit tests verify uniqueness across consecutive requests

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-04-21 08:01:30 -04:00

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