fix: honor local embedding model option

[mturac]

Summary

• pass the configured local embedding model through to the embedding provider
• keep the existing local endpoint/model defaults when no override is set
• add regression coverage for custom local embedding model selection

Fixes #725

Validation

• git diff --check
• npm test -- test/embedding-provider.test.ts
• npm run build

Summary by CodeRabbit

• New Features
  • Local embedding model selection is now configurable via environment variable, allowing users to specify custom models while maintaining a default multilingual model fallback.

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[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: aa9dfceb-3bd5-4f48-90a3-d4724e792d73

📥 Commits

Reviewing files that changed from the base of the PR and between d442fee and 1f0eb55.

📒 Files selected for processing (2)

• src/providers/embedding/local.ts
• test/embedding-provider.test.ts

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📝 Walkthrough

Walkthrough

The PR makes the local embedding provider's model selection configurable via the LOCAL_EMBEDDING_MODEL environment variable, adding a multilingual default (paraphrase-multilingual-MiniLM-L12-v2) that replaces the hardcoded English-only model. Tests confirm both default and custom model scenarios work correctly.

Changes

Local Embedding Model Configuration

Layer / File(s)	Summary
Configurable embedding model constant and pipeline initialization src/providers/embedding/local.ts	Exports DEFAULT_LOCAL_EMBEDDING_MODEL constant and updates the transformer pipeline to read from LOCAL_EMBEDDING_MODEL environment variable with fallback.
LocalEmbeddingProvider test suite and mock infrastructure test/embedding-provider.test.ts	Mocks @xenova/transformers, imports the new provider and constant, extends test cleanup to reset environment and mocks, and adds test cases for default and custom model behavior.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested reviewers

• rohitg00

Poem

🐰 Whiskers twitch as models bloom,
Multilingual fills the room,
English-only? No more, dear friend,
Russian queries find their end,
Xenova dances, configured free! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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: making the local embedding model configurable via environment variable rather than hardcoded.
Linked Issues check	✅ Passed	The PR fully satisfies issue #725: makes local embedding model configurable via LOCAL_EMBEDDING_MODEL, changes default to multilingual model (Xenova/paraphrase-multilingual-MiniLM-L12-v2), and adds regression test coverage.
Out of Scope Changes check	✅ Passed	All changes are directly within scope: configurable model support, multilingual default, environment variable handling, and corresponding test coverage—no extraneous modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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