[Feature]: Add DeepSeek V3.2 chat template support

[qianlihuang]

Motivation

This PR adds chat template support for DeepSeek V3.2. https://huggingface.co/deepseek-ai/DeepSeek-V3.2

Modifications

• Register deepseek-v32 chat template in specforge/data/template.py
• Add fallback rendering logic in specforge/data/parse.py for tokenizers without built-in chat_template (DeepSeek V3.2 tokenizer does not provide one)
• Add unit test and reference for DeepSeek V3.2 in tests/test_data/test_parsers.py and tests/test_data/test_references/deepseek-v32_ref.json

Related Issues

Roadmap #374

Accuracy Test

Benchmark & Profiling

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling and Accuracy Results.
• For reviewers: If you haven't made any contributions to this PR and are only assisting with merging the main branch, please remove yourself as a co-author when merging the PR.
• Please feel free to join our Slack channel at https://sgl-fru7574.slack.com/archives/C09784E3EN6 to discuss your PR.

[gemini-code-assist]

Warning

You have reached your daily quota limit. Please wait up to 24 hours and I will start processing your requests again!

[Copilot]

Pull request overview

This PR adds chat template support for DeepSeek V3.2 by registering a new template configuration and implementing fallback rendering logic for tokenizers that lack built-in chat templates.

Key Changes

• Registers the deepseek-v32 chat template with thinking parser support
• Adds fallback rendering logic to manually construct conversation strings when tokenizer's apply_chat_template fails
• Adds unit test for DeepSeek V3.2 template with reference data

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
specforge/data/template.py	Registers new deepseek-v32 template with thinking parser type, similar headers to deepseek-v3 but with empty system prompt
specforge/data/parse.py	Adds try-except fallback in GeneralParser.parse to manually construct conversation strings when tokenizer lacks chat_template
tests/test_data/test_parsers.py	Adds test_deepseek_v32 test method following existing test patterns
tests/test_data/test_references/deepseek-v32_ref.json	Adds reference data for regression testing (identical to deepseek-v3 for standard test messages)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.