fix(pic): include request path in PocketIC server error messages (#70)

[nikosxenakis]

Motivation

When a PocketIC instance is deleted while async operations are still in-flight, the resulting "Instance was deleted"
error provides no context about which call was orphaned, making it hard to track
down the offending line.

Closes #70

Summary

• Include the request path in ServerError messages thrown by jsonGet and jsonPost in the HTTP client, e.g. PocketIC server error: Instance was deleted (/api/v2/instances/0/read/query)

[Copilot]

Pull request overview

This PR improves PocketIC client diagnostics by including the HTTP request path in ServerError messages emitted from the HTTP2 client, making it easier to identify which in-flight request failed (e.g., after an instance is deleted).

Changes:

• Append init.path to ServerError messages thrown on { message: ... } error responses in jsonGet.
• Append init.path to ServerError messages thrown on { message: ... } error responses in jsonPost.
• Update the Http2Client unit test expectation for jsonGet error messaging.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/pic/src/http2-client.ts	Adds request path context to ServerError messages for error responses in jsonGet/jsonPost.
packages/pic/tests/src/util/http2-client.spec.ts	Updates jsonGet error-response test to match the new error message format.

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