fix: update default LM Studio model from ministral-3b to qwen3.5-4b

[ArtemisMucaj]

https://claude.ai/code/session_01WmJo6QyjHsyjW7vBa4z9pu

Summary by CodeRabbit

• Chores
  • Updated default embedding model configuration from Mistral to Qwen. This change affects the reranking behavior used by the system. Documentation and configuration defaults have been aligned to reflect the new model selection.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 74f1fe7f-4b93-4af0-93e7-4e82ac7f9b28

📥 Commits

Reviewing files that changed from the base of the PR and between 8230ffd and b30c10d.

📒 Files selected for processing (4)

• docs/features/embedding-backends.md
• src/connector/adapter/anthropic_client.rs
• src/connector/adapter/anthropic_reranking.rs
• src/connector/adapter/lm_studio_reranking.rs

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📝 Walkthrough

Walkthrough

This pull request updates the default model configuration across multiple components and documentation files, replacing "mistralai/ministral-3-3b" with "qwen/qwen3.5-4b" in API backend configuration, constants, and documentation comments.

Changes

Cohort / File(s)	Summary
Default Model Configuration docs/features/embedding-backends.md, src/connector/adapter/anthropic_client.rs, src/connector/adapter/anthropic_reranking.rs, src/connector/adapter/lm_studio_reranking.rs	Updated default ANTHROPIC_MODEL from mistralai/ministral-3-3b to qwen/qwen3.5-4b in configuration table, constants, and documentation comments across all files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 Whiskers twitch with delight,
A model change, shiny and bright,
From Mistral to Qwen, we leap with cheer,
Configuration flows crystal clear! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the default LM Studio model from ministral-3b to qwen3.5-4b, which is reflected consistently across all modified files in the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/update-default-lm-studio-model-cqLcZ

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