Replace gh CLI and curl-based GitHub API interactions with native
GitHub MCP tools (mcp_github_*). This modernizes the skill to use
the agent's built-in MCP integration for all GitHub operations.
Key changes:
- Replace gh CLI commands with mcp_github_pull_request_read(),
mcp_github_pull_request_review_write(), etc.
- Replace curl API calls with mcp_github_add_issue_comment(),
mcp_github_add_comment_to_pending_review(), etc.
- Add mcp_github_run_secret_scanning() to security checklist
- Add mcp_github_request_copilot_review() as optional step
- Add quick reference table mapping tasks to MCP tools
- Keep git CLI for local diff operations (unchanged)
- Bump version to 2.0.0
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