[Bugfix][Frontend] Preserve GLM-4.7 MoE's unclosed final tool argument

[Ludvins]

Purpose

Addresses the GLM-4.7 MoE part of #57827. When a tool call ends without closing its final </arg_value> tag, final conversion drops that argument. This change preserves it.

Adds streaming and non-streaming regression tests for both closed and unclosed final values. This is separate from #58349, which fixes MiniMax M2, and #53739, which changes the shared streaming engine.

AI assistance was used to develop this change.

Test Plan

Run the focused parser suite:

VLLM_TARGET_DEVICE=cpu .venv/bin/python -m pytest --confcutdir=tests/parser/engine tests/parser/engine/test_glm47_moe.py -v

Run the repository's pre-commit hooks on the changed files.

Test Result

• 18 GLM parser tests passed, including the new regression cases.
• All applicable pre-commit hooks passed.
• No model inference evaluation was run. This is deterministic post-generation parsing, covered by CPU-only parser tests.

[claude]

Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

[github-actions]

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[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @Ludvins.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork