fix: lsTool path management and improve workspace file resolution

[andreapizzato]

Description

Code changes:

• removed custom path rewriter for lsTool using the IDE/Platform-provided path resolution
• fixed an issue where a file could be resolved within the workspace but being reported as non-existent

Targeted issues

Here's a few of the issues I've found which should be cleared with this change:

• ls tool can list os file system root contents when policy is set to "Automatic" and dirPath is '.' #8877
• Fail to call Qwen3-Coder model with tool calling enabled #8744
• Groq Tool Call is not working #6220

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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

Screen recording or screenshot

The best demo of this fix is to compare the current main with the branch running the same task; you can view the demo I just recorded.

Tests

I actually had to remove some tests because they were testing the removed function; that specific functionality is tested elsewhere both in the codebase and in the supporting vscode/node SDKs.

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Summary by cubic

Switch lsTool to the IDE path resolver and fix workspace URI checks to prevent false “directory/file not found” errors. Addresses #8877, #8744, #6220.

• Bug Fixes
  • Use IDE-provided path resolution in lsTool; remove custom path rewriter.
  • Verify file existence using the resolved workspace URI, not the raw input.
  • Return a clear error when dirPath is missing.

^{Written for commit 9a7d15b. Summary will update automatically on new commits.}

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[andreapizzato]

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Documentation Review

I've reviewed this PR for documentation updates. No documentation changes are needed because:

1. Internal refactoring only - The changes simplify internal path handling without affecting the user-facing API
2. No API changes - The ls tool still accepts the same parameters (dirPath and recursive)
3. No existing documentation describes the internal path resolution logic that was changed
4. The tool definition in core/tools/definitions/ls.ts remains unchanged

The improvements (removing custom path rewriting, fixing workspace file resolution) are implementation details that don't require user documentation updates.

[cubic-dev-ai]

No issues found across 3 files