Add pr-review-toolkit agents and review-pr command

[dceoy]

Summary

• Add review-pr command and skill for comprehensive PR review workflows
• Implement pr-review-toolkit agents: code-reviewer, code-simplifier, comment-analyzer, pr-test-analyzer, silent-failure-hunter, type-design-analyzer
• Update action.yml to expose review-pr command and toolkit configuration
• Update README with new review-pr documentation and workflow examples

Changes

• New agents under .opencode/agent/ for specialized code review scenarios
• New skill under .opencode/skills/review-pr/ for PR review workflow
• New command under .opencode/command/review-pr.md documenting review-pr usage
• Updated action.yml inputs, outputs, and composite steps
• Updated README with review-pr command documentation and examples
• Updated .gitignore to exclude toolkit configurations

Test plan

• QA script passes (prettier, yamllint, actionlint, zizmor, checkov)
• Manual testing of review-pr command in a workflow
• Verify agents are discoverable and documented

🤖 Generated with Claude Code

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