chore(master): release 2.3.0

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🤖 I have created a release

2.3.0 (2026-04-28)

Features

• Add test infrastructure with multi-version Ruby support (9c16d4c)
• Add test infrastructure with multi-version Ruby support (232e569)

Bug Fixes

• Add flush before rewind in Tempfile tests (4c31ad3)
• align string concatenation indentation in gemspec (963d995)
• replace each_with_object with to_h to satisfy RuboCop (2cd5831)
• wrap gemspec description to satisfy line length lint (3c4b49a)

Documentation

• update README sections to align with CLI deprecation (0e5a391)

Miscellaneous Chores

• deprecate CLI in favor of deployhq-cli (f983bc6)
• deprecate CLI in favor of deployhq-cli (40b233a)
• Switch test framework from Minitest to RSpec (d766068)
• Update gemspec metadata (7dbd6f8)

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