feat(rdmacm): support setting private data in rdmacm conn param

[dragonJACson]

For #111

[gemini-code-assist]

Code Review

This pull request removes the Cirrus CI configuration, adds new keywords to Cargo.toml, and introduces helper methods in src/rdmacm/communication_manager.rs to retrieve event private data and configure connection parameters. Feedback on the changes highlights two critical safety issues: first, unconditionally accessing the param.conn union member in Event::private_data can cause undefined behavior for datagram port spaces or invalid event types; second, storing a raw pointer to a short-lived slice in ConnectionParameter::setup_private_data without lifetime tracking can lead to use-after-free bugs, meaning the function should be marked as unsafe or refactored.

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[codecov]

Codecov Report

❌ Patch coverage is 85.30612% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/rdmacm/communication_manager.rs	85.30%	36 Missing ⚠️

Files with missing lines	Coverage Δ
src/rdmacm/communication_manager.rs	87.52% <85.30%> (+80.34%)	⬆️

... and 7 files with indirect coverage changes

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[Copilot]

Pull request overview

This PR extends the RDMA CM wrapper to support sending and receiving connection private data via RDMA CM connection parameters/events, and updates CI metadata to better validate RDMA functionality.

Changes:

• Add Event::private_data() to expose peer-provided private data on connection events.
• Add ConnectionParameter::setup_private_data() to configure private data for connect/accept.
• Update CI/config metadata (GitHub Actions RXE test job, crate keywords, remove Cirrus CI config).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
src/rdmacm/communication_manager.rs	Adds APIs to set connection private data and to read private data from connection events (plus extensive docs).
Cargo.toml	Extends crate keywords for discoverability.
.github/workflows/test.yml	Adds a new RXE-based CI job to run RDMA tests in a simulated environment and upload coverage.
.cirrus.yml	Removes Cirrus CI configuration.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.