chore(seed): add api-wide-base-path-with-default to allowedFailures for csharp-sdk

[Swimburger]

Description

The new api-wide-base-path-with-default fixture introduced in #15998 causes seed test failures for csharp-sdk. This adds the fixture to allowedFailures until the generator supports the new feature.

Note: php-sdk was already fixed on main via #16006.

Changes Made

• Added api-wide-base-path-with-default to allowedFailures in seed/csharp-sdk/seed.yml

Testing

• Verified the fixture is the cause of failure by inspecting CI logs from PR feat(openapi): Add better support for x-fern-base-path #15998 (job ID 76884683824 for csharp-sdk)
• CI shows ❌ THERE WERE UNEXPECTED TEST CASE FAILURES: ... api-wide-base-path-with-default

Link to Devin session: https://app.devin.ai/sessions/eae9060efee04cb49d8451238ffd1ce9
Requested by: @Swimburger

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SDK Generation Benchmark Results

Comparing PR branch against median of 5 nightly run(s) on main (latest: 2026-05-20T05:20:23Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
csharp-sdk	square	67s (n=5)	105s (n=5)	61s	-6s (-9.0%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-05-20T05:20:23Z). Trigger benchmark-baseline to refresh.
Last updated: 2026-05-20 20:12 UTC