[aarongiuffre]

Summary

Fix GLM tool-call argument parsing that could fail with: GLM tool call requires an argument key.

Validation

• Built the updated Flare binary on the NVIDIA Spark environment.
• Verified matching binary hashes across both Spark nodes.
• Ran a controlled GLM-5.3-Flash NVFP4 QAD chat completion with tool_choice=required.
• Confirmed the OpenAI-compatible API returned a lookup_weather tool call with valid JSON arguments.

Testing notes

The controlled tool-call test passed. Additional regression coverage for other argument encodings and streaming responses would be useful.

[original-el8]

This PR and #179 need a shared tool-argument semantics decision. This diff adds array coercion (including comma splitting and wrapping strings in arrays) and richer parse errors. #179 deliberately retains generated off-schema values without coercion, with streaming coverage for #39. They are overlapping proposals, not interchangeable fixes.

Marked triage:design-review. Decide the non-strict argument contract first, then retain the necessary parser change and regression coverage. The argument-key failure named in this PR's title also needs a focused reproducer; its diagnostic changes alone do not establish that the failure is fixed.

[original-el8]

Marked triage:verify-for-closure after #179 merged as 9d1e0137. Main now retains GLM tool arguments that do not match declared schema types, addressing the stream-abort problem that motivated coercion proposals.

This PR also adds comma-splitting/string-to-array coercion and diagnostics, which are different semantics from retaining the generated value. Re-establish a failing input on main before carrying those changes forward; a successful controlled tool call alone does not show that they remain necessary. Close the proposal if its target failure is resolved, or narrow it to the remaining demonstrated defect.

@aarongiuffre GitHub reports merge conflicts with main, confirmed locally with git merge-tree for PR head 1f38c71d0dde against main 97cfeb0001f1. Conflicting paths:

• helios/src/output/tagged.rs

Please reconcile the branch with main and rerun the checks affected by the resolution.