feat: wait for service dependencies with cancellation and backoff - #4956
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Services currently duplicate startup retry loops for dependencies that register after they start.
Add micro.WaitForService with capped exponential backoff and context cancellation. Require an addressable discovered node, with an optional repeatable readiness probe for application-level checks. Preserve the last completed error alongside the caller cancellation/deadline. Document that discovery alone does not prove readiness and context-ignoring backends can finish one in-flight call later.
Validation: fake-registry tests cover delayed discovery, empty addresses, probe retries, cancellation before/during discovery, and error preservation. Repository build and golangci-lint pass. Full tests run in CI.
Closes #4940