Feat/multi server

[mechanik-daniel]

Multi-server support via $useFhirServer

Summary

This PR adds multi-server support by allowing an expression to switch the active FHIR client within the current lexical scope using $useFhirServer(...).

What changed

• Adds an optional connectionResolver to compile-time and runtime options so Fumifier can resolve a named connection or inline server target to a FHIR client.
• Routes FHIR client wrapper functions through the active connection when $useFhirServer(...) is set, while falling back to the default fhirClient otherwise.
• Resets the active connection back to the default client when $useFhirServer() is called with no arguments.
• Keeps terminology helpers such as $translateCode(...) pinned to terminologyRuntime so server switching only affects FHIR client operations.
• Replaces evaluator-level special-casing with normal environment scoping so connection selection behaves consistently across nested blocks, constructors, and function-call argument evaluation.

Behavior notes

• $useFhirServer('myConn') switches to a named connection for the current lexical frame.
• $useFhirServer('https://example.org/fhir', { ...config }) passes both the target and config object to connectionResolver.
• $useFhirServer() clears the override and restores the default client.
• Connection selection does not leak outside the block where it is set.

Testing

• Adds focused coverage for named connection switching.
• Verifies lexical scoping and reset behavior across nested blocks.
• Verifies later array entries, object entries, and function-call arguments in the same frame use the selected connection.
• Verifies URL targets and inline config are forwarded to connectionResolver.
• Verifies resolver failures surface correctly.
• Verifies terminology calls do not use the connection resolver.

[Copilot]

Pull request overview

Adds multi-server support by introducing $useFhirServer(...) to switch the active FHIR client within a lexical scope via an optional connectionResolver.

Changes:

• Introduces connectionResolver in compile-time and runtime options and routes FHIR client wrapper calls through the active connection override.
• Adds $useFhirServer(...) to set/clear the active connection per lexical frame, while keeping terminology helpers pinned to terminologyRuntime.
• Adds a focused test suite for connection switching/scoping behavior and bumps package versions.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/fumifier.js	Adds connectionResolver option plumbing and $useFhirServer binding; updates FHIR wrapper routing and clarifies terminology pinning.
test/use-fhir-server.test.js	New tests validating named/URL switching, scoping, reset behavior, resolver forwarding, and terminology isolation.
package.json	Version bump to 2.2.0 and dependency updates.
package-lock.json	Lockfile updated to match dependency/version changes.

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