refactor: codebase cleanup and consistency improvements

[scalvert]

Summary

A comprehensive cleanup pass addressing code consistency, library usage, and build configuration issues.

Changes

• Rename flexsearch-indexer → flexsearch-core - Avoid confusion with the provider class in src/providers/indexers/
• Use hast-util-to-html library - Replace ~70 lines of hand-rolled HTML serialization
• Refactor tool definitions - Make tool files the single source of truth with Zod schemas; server imports definitions
• Unify CORS handling - Add shared CORS utility; all adapters now handle CORS consistently
• Fix build warnings - Resolve mixed exports warning and unused import warning
• Update README - Document correct 2-tool API (docs_search, docs_fetch)

Commits

Each commit is atomic and addresses one logical change:

1. refactor: rename flexsearch-indexer.ts to flexsearch-core.ts
2. refactor: use hast-util-to-html for HTML serialization
3. refactor: make tool definitions complete and import into server
4. refactor: unify CORS handling across all adapters
5. fix: resolve build warnings for exports and externals
6. docs: update README with correct 2-tool API

Test plan

• npm run build completes without warnings
• npm run typecheck passes
• npm test - all 51 unit tests pass
• npm run test:mcp - all 11 MCP integration tests pass

🤖 Generated with Claude Code

[scalvert]

Code review

Found 1 issue:

1. Vercel adapter incorrectly merges CORS headers into JSON response body (bug: inconsistent CORS handling within the same file)

In src/adapters/vercel.ts, the GET health check endpoint merges CORS headers into the JSON body instead of setting them as HTTP headers:

return res.status(200).json({ ...status, ...corsHeaders });

This is inconsistent with how CORS is handled elsewhere in the same file:

• Line 59: res.writeHead(204, corsHeaders) - correctly sets HTTP headers for OPTIONS
• Lines 73-75: res.setHeader() - correctly sets HTTP headers for 405 errors
• Lines 88-90: res.setHeader() - correctly sets HTTP headers for POST requests

The fix should set CORS headers via res.setHeader() before returning the JSON response, similar to lines 88-90.

docusaurus-plugin-mcp-server/src/adapters/vercel.ts

Lines 64 to 69 in 858be80

	// Handle GET requests for health check
	if (req.method === 'GET') {
	const mcpServer = getServer();
	const status = await mcpServer.getStatus();
	return res.status(200).json({ ...status, ...corsHeaders });
	}

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