chore: release v0.3.0

[github-actions]

🤖 New release

• socketeer: 0.2.0 -> 0.3.0

Changelog

[0.3.0] - 2026-04-10

Features

• Add ConnectOptions, configurable keepalive, and connect_with(5467716)
• Add send_raw and next_raw_message methods(3652f25)
• Add ConnectionHandler trait for lifecycle hooks(d3d1048)

Bug Fixes

• (ci) Enable all features for coverage so tests are included(142abe8)

Testing

• Add auth_echo_server and tests for new features(7f9cbfe)

Miscellaneous Tasks

• Bump version to 0.3.0, update README(4c74ff7)

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This PR was generated with release-plz.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.49%. Comparing base (142abe8) to head (b896557).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files           4        4           
  Lines         415      415           
=======================================
  Hits          388      388           
  Misses         27       27           

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