feat(work-packages): add ranked search tool over subject, description, and comments

Registers openproject_search_work_packages (readOnly: true), taking the tool
registry from 18 to 19. searchWorkPackages now unions a precise server-side
subject filter with a broad recency-ordered candidate window, ranks via the
shared search pipeline, and deep-enriches top candidates with description and
comment text. Exact-mode requests skip the broad query entirely.

searchWorkPackages's return type changes from a flat PaginatedResult<WorkPackageSummary>
to WorkPackageSearchPage, nesting the summary under `workPackage` alongside
score, matchedFields, and an optional snippet.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/mcp-server.test.ts

@@ -5,7 +5,7 @@ import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"
 import { createServer, SERVER_NAME, SERVER_VERSION } from "../src/server";
 
 describe("MCP Server Factory", () => {
-  test("creates server and lists all 18 tools via InMemoryTransport", async () => {
+  test("creates server and lists all 19 tools via InMemoryTransport", async () => {
     const config = {
       baseUrl: "http://localhost:8080",
       apiKey: "test-key",
@@ -21,13 +21,14 @@ describe("MCP Server Factory", () => {
     await client.connect(clientTransport);
 
     const toolsResult = await client.listTools();
-    expect(toolsResult.tools).toHaveLength(18);
+    expect(toolsResult.tools).toHaveLength(19);
     const names = toolsResult.tools.map((t) => t.name);
     expect(names).toContain("openproject_list_projects");
     expect(names).toContain("openproject_get_project");
     expect(names).toContain("openproject_list_work_packages");
     expect(names).toContain("openproject_get_work_package");
     expect(names).toContain("openproject_list_work_package_activities");
+    expect(names).toContain("openproject_search_work_packages");
     expect(names).toContain("openproject_list_queries");
     expect(names).toContain("openproject_get_query");
     expect(names).toContain("openproject_list_types");
@@ -143,7 +144,7 @@ describe("MCP Server Factory", () => {
 
     // In read-only mode, only readOnly: true tools should be registered
     const toolsResult = await client.listTools();
-    expect(toolsResult.tools).toHaveLength(18);
+    expect(toolsResult.tools).toHaveLength(19);
 
     await client.close();
     await mcpServer.stop();