fix(csharp): align release verifier with generated surface

[sxlijin]

Summary

• Fixes the deterministic C# verification failure in the baml_language 0.17.0 production release run: https://github.com/BoundaryML/baml/actions/runs/31857280879
• Aligns the phase-12 package consumer with the generated C# surface established by Math ops for baml.time.* #4366, which intentionally omits methods inherited through BAML interface implementations.
• Keeps runtime coverage for the C# CSV methods and resource fields that are generated.

Root cause

The phase-12 fixture is normally ignored because of B-1059, but the production full-surface package verifier compiles and runs it. Its stale calls to CsvReader.Iter/Next and CsvRows.Iter/Next no longer compile after #4366 removed interface-implementation methods from generated class method collections.

Validation

• cargo nextest run -p sdk_test_csharp --all-features --run-ignored only -E test(test_phase12_executes_native_typed_resource_apis_lifetimes_and_state)
• dotnet build sdk_tests/crates/csharp/phase12_resources/Phase12Resources.csproj --configuration Release --no-restore
• git diff --check

Release follow-up

After this merges and post-merge canary CI succeeds, 0.17.0 must be dispatched from the new immutable baml-language source tag. This PR does not publish or dispatch the release.

Summary by CodeRabbit

• Tests
  • Updated C# CSV resource validation to verify headers, reader availability, and the initial reading position.
  • Simplified resource cleanup validation to ensure the active CSV reader is properly closed.
  • Removed checks for iterator identity, typed row decoding, and raw record access.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 16424d2d-e829-4794-a20f-55cd85dacea9

📥 Commits

Reviewing files that changed from the base of the PR and between e3301d1 and 2573d8c.

📒 Files selected for processing (1)

• baml_language/sdk_tests/crates/csharp/phase12_resources/Program.cs

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📝 Walkthrough

Walkthrough

The C# CSV resource test removes iterator, typed decoding, and raw-record assertions. It now checks headers, CsvRows.Reader, skipped-record state, and an initial position of 0. Cleanup closes csvReader.

Changes

CSV resource test updates

Layer / File(s)	Summary
Reader contract validation baml_language/sdk_tests/crates/csharp/phase12_resources/Program.cs	The test validates headers, the public reader, skipped-record state, and initial position. It removes row iteration and raw-record checks. Cleanup closes csvReader.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 2573d

This localized change updates the C# release verifier to match the generated API surface while retaining coverage for supported methods and fields. The targeted test and Release build are provided, and no actionable merge-blocking risk remains.

Suggested reviewers: rossirpaulo

Poem

A rabbit checks the reader’s start,
With headers lined in tidy art.
No rows are spun, no records roam,
csvReader closes, safe at home.
The CSV test hops on.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the C# release verifier fix and its alignment with the generated surface.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sxlijin/fix-baml-language-0.17.0-csharp-release-verifier

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[github-actions]

⏭️ Performance benchmarks were skipped

Perf benchmarks (CodSpeed) are opt-in on pull requests — they no longer run on every push. They always run automatically after merge to canary/main.

To run them on this PR, do any of the following, then push a commit (or re-run CI):

• Add RUN_CODSPEED=1 to the PR description, or
• Include run-perf or /perf in the PR title or any commit message.

[sxlijin]

@coderabbitai review

[coderabbitai]

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

[github-actions]

Binary size checks passed

✅ 7 passed

	Artifact	Platform	File	Gzip	Gated on	Baseline	Delta	Status
✅	baml-cli	Linux	🔒 26.5 MB	11.2 MB	file	27.4 MB	-912.8 KB (-3.3%)	OK
✅	packed-program	Linux	🔒 17.2 MB	6.9 MB	file	18.6 MB	-1.4 MB (-7.4%)	OK
✅	baml-cli	macOS	🔒 20.6 MB	9.7 MB	file	21.3 MB	-697.9 KB (-3.3%)	OK
✅	packed-program	macOS	🔒 13.5 MB	6.1 MB	file	14.5 MB	-950.1 KB (-6.6%)	OK
✅	baml-cli	Windows	🔒 22.2 MB	10.0 MB	file	23.0 MB	-770.7 KB (-3.4%)	OK
✅	packed-program	Windows	🔒 14.4 MB	6.1 MB	file	15.5 MB	-1.1 MB (-7.4%)	OK
✅	bridge_wasm	WASM	15.8 MB	🔒 4.2 MB	gzip	4.6 MB	-404.7 KB (-8.8%)	OK

🔒 = the size this artifact is GATED on (ceiling + delta). Binaries gate on file size (installed binary); WASM gates on gzip (download size). The other size is shown for information only.

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Generated by cargo size-gate · workflow run

[sxlijin]

Attempt 2 of the 0.17.0 release run confirmed the same deterministic failure: https://github.com/BoundaryML/baml/actions/runs/31857280879/attempts/2?pr=4446

The phase-12 consumer fails to compile because generated CsvReader has no Iter/Next and generated CsvRows has no Iter/Next/NextAsync. This PR removes those stale interface-implementation calls and has already passed the exact phase-12 native integration test locally.