fix: replace dynamic import with static import for GitHubIndexer

[prosdev]

Problem

The dev_gh MCP tool was failing with error:

MCP error -32001: GitHubIndexerClass is not a constructor

Root Cause

The dynamic import in github-adapter.ts was not correctly importing the GitHubIndexer class:

const { GitHubIndexer: GitHubIndexerClass } = await import('@lytics/dev-agent-subagents');

Solution

Changed to static import to match the pattern used in status-adapter.ts:

import {
  GitHubIndexer,
  type GitHubDocument,
  type GitHubSearchOptions,
  type GitHubSearchResult,
} from '@lytics/dev-agent-subagents';

Changes

• ✅ Replaced dynamic import() with static named import
• ✅ Now uses direct instantiation with new GitHubIndexer()
• ✅ Consistent with status-adapter.ts implementation

Testing

• ✅ Build successful
• ✅ Manual testing confirmed dev_gh tool works correctly
• ✅ Both search and context actions verified

Impact

• Fixes dev_gh tool functionality in MCP server
• Users can now search GitHub issues/PRs via MCP