Release v1.3.0: Docker container isolation

[igmarin]

Summary

• Bump SkillBench::VERSION to 1.3.0
• Promote CHANGELOG [Unreleased] isolation notes to ## [1.3.0] - 2026-08-08
• Record ProviderConfig explicit-nil fix and docker/CI docs under 1.3.0
• Date the historical 1.2.0 section (already released 2026-07-01)

Context

Milestone container-isolation-v1 is closed. Issues #89/#90 closed as shipped.

Test plan

• VERSION is 1.3.0
• CI green on PR
• After merge: tag v1.3.0, GitHub release, gem push

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📥 Commits

Reviewing files that changed from the base of the PR and between 903d38b and fcdf5e1.

⛔ Files ignored due to path filters (1)

• Gemfile.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• CHANGELOG.md
• lib/skill_bench/version.rb
• test/evaluator/agent_evaluator_test.rb

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