Fix code formatting and eliminate Rust compiler warnings

[Copilot]

This PR addresses code quality issues by fixing formatting inconsistencies and eliminating compiler warnings across the codebase.

Changes Made

Rust Code Quality Fixes

• Applied cargo fmt to standardize code formatting across all Rust source files
• Eliminated all compiler warnings by removing unused code:
  • Removed unused finished field from ItemIterator and FastItemIterator structs
  • Removed unused 'outer label in iterator loop
  • Removed unused advance_to_next_leaf method
  • Removed unused Duration import in delete profiler binary

Python Code Quality Fixes

• Applied black formatting to ensure consistent Python code style
• Reformatted 11 Python files to comply with Black's formatting standards

Testing Results

• ✅ All Rust tests passing (100% test suite success)
• ✅ Python tests mostly passing (138/147 tests pass - remaining failures are environment-specific memory leak detection tests)

Impact

These changes improve code maintainability and eliminate distracting compiler warnings without affecting functionality. The codebase now adheres to consistent formatting standards and has a cleaner compilation profile.

Files Changed

• Multiple Rust source files in rust/src/ directory
• Multiple Python test files in python/tests/ directory
• Binary utilities in rust/src/bin/

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

Pull Request Overview

This PR addresses code quality issues by applying automated formatting tools and eliminating compiler warnings across the Rust and Python codebases.

• Applied cargo fmt to standardize Rust code formatting
• Removed unused fields, variables, and methods to eliminate Rust compiler warnings
• Applied black formatting to ensure consistent Python code style

Reviewed Changes

Copilot reviewed 14 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rust/src/node.rs	Reformatted multiline tuple return for better readability
rust/src/iteration.rs	Removed unused fields from iterator structs and simplified iterator logic
rust/src/delete_operations.rs	Applied formatting to method calls and function parameters
python/tests/*.py	Applied black formatting to break long lines and improve readability
python/coverage.xml	Updated coverage report with new test results
python/conftest.py	Added blank line after docstring

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>, please review it.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.

Support

Need help? Join our Discord community for assistance with any issues or questions.

CodeRabbit Commands (Invoked using PR/Issue comments)

Type @coderabbitai help to get the list of available commands.

Other keywords and placeholders

• Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
• Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
• Add @coderabbitai anywhere in the PR title to generate the title automatically.

CodeRabbit Configuration File (.coderabbit.yaml)

• You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
• Please see the configuration documentation for more information.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Status, Documentation and Community

• Visit our Status Page to check the current availability of CodeRabbit.
• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.