Added

• GitHub integration: list open issues per repository with state and assignee filters (GET /repo/:owner/:repo/issues, MCP github_list_issues).
• GitHub integration: list open pull requests per repository with state filter (GET /repo/:owner/:repo/pulls, MCP github_list_prs).
• GitHub integration: merge a pull request from MDPlanner (PUT /repo/:owner/:repo/pulls/:n/merge, MCP github_merge_pr). Supports squash, merge, and rebase strategies.
• GitHub view: expandable repo rows showing inline issues and PRs. Issues assigned to the authenticated user are highlighted. Open PRs have a merge button.
• GitHub provider: listIssues, listPRs, mergePR methods added to the provider interface.
• Issue and PR types now include labels, assignee, createdAt fields. PR type adds headBranch and reviewDecision.