chore(master): release 1.4.0

[github-actions]

🤖 I have created a release

1.4.0 (2026-02-19)

Features

• Add RSpec test suite and multi-version Ruby CI support (fd1d1ab)
• Add RSpec test suite and multi-version Ruby CI support (bd59b61)

Bug Fixes

• Exclude vendor directory from RuboCop inspection (b12a7cb)
• Remove redundant gem activation calls from agent.rb (e0e3bf4)
• Update dependencies to support GCC 14 / Debian 13 (6a75ad0)
• Update nio4r, timers, and rb-readline to support modern compilers (0e050a5)

Documentation

• Add language identifier to code block in CLAUDE.md (369fe90)

---

This PR was generated with Release Please. See documentation.

[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.

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

🤖 Created releases:

• v1.4.0

🌻