improve: instruct model when no context results were retrieved

[uinstinct]

Description

When no results were retrieved during context embeddings, instruct model to use other tools.

Resolves CON-2400

Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screenshots

before.mp4

after.mp4

Tests

Replication

1. Launch the extension
2. Add a new .continueignore in the manual testing sandbox which excludes all the files

.continueignore

``` .continueignore AdvancedPage.tsx calculator_test Calculator.java config.yaml data.json Dockerfile example.ipynb nested-folder program.cs query.sql readme.md requirements.txt test.css test.csv test.html test.js test.kt test.php test.py test.rb test.rs test.sh test.ts ```

3. reindex the codebase
4. prompt the model using @codebase

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[recurseml]

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[sestinj]

We shouldn't send this message when the user in in chat mode, because the model won't have access to any tools.

I realize we might not have a way of knowing this in core yet, so potentially not a trivial change. But seems important

[uinstinct]

core is stateless right?
if so, we might need to pass a parameter when getting context items or add a protocol in IDE

[sestinj]

Yeah that's correct. I feel like passing it as a parameter would be the easier option