fix: declare inputSchema properties for search and timeline MCP tools (#1384 #1413)

Both tools had properties:{} which prevents MCP clients from exposing
params to the LLM, causing every call to send {} and get a 500 error
("Either query or filters required for search").

- search: declare query, limit, project, type, obs_type, dateStart, dateEnd, offset, orderBy
- timeline: declare anchor, query, depth_before, depth_after, project
- Add 3 schema regression tests (static source validation)

Closes #1384
Closes #1413

Co-Authored-By: Claude <noreply@anthropic.com>

tests/servers/mcp-tool-schemas.test.ts

@@ -0,0 +1,56 @@
+/**
+ * Tests for MCP tool inputSchema declarations (fix for #1384 / #1413)
+ *
+ * Validates that search and timeline tools declare their parameters explicitly
+ * so MCP clients (Claude Code) can expose them to the LLM.
+ */
+import { describe, it, expect } from 'bun:test';
+
+// Import the tools array directly — static schema validation, no server needed
+import '../../src/servers/mcp-server.js';
+
+// Re-import via dynamic require to access the tools array
+const mcpServerPath = new URL('../../src/servers/mcp-server.ts', import.meta.url).pathname;
+
+describe('MCP tool inputSchema declarations', () => {
+  let tools: any[];
+
+  // Load tools by reading the source and extracting the exported structure
+  // We test the schema shape directly from the source constants
+  it('search tool declares query parameter', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    // Verify search properties are declared (not empty)
+    expect(src).toContain("name: 'search'");
+    // Check query is declared in properties after the search tool definition
+    const searchSection = src.slice(src.indexOf("name: 'search'"), src.indexOf("name: 'timeline'"));
+    expect(searchSection).toContain("query:");
+    expect(searchSection).toContain("limit:");
+    expect(searchSection).toContain("project:");
+    expect(searchSection).toContain("orderBy:");
+    expect(searchSection).not.toContain("properties: {}");
+  });
+
+  it('timeline tool declares anchor and query parameters', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    const timelineSection = src.slice(
+      src.indexOf("name: 'timeline'"),
+      src.indexOf("name: 'get_observations'")
+    );
+    expect(timelineSection).toContain("anchor:");
+    expect(timelineSection).toContain("query:");
+    expect(timelineSection).toContain("depth_before:");
+    expect(timelineSection).toContain("depth_after:");
+    expect(timelineSection).toContain("project:");
+    expect(timelineSection).not.toContain("properties: {}");
+  });
+
+  it('get_observations still declares ids (regression check)', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    const getObsSection = src.slice(src.indexOf("name: 'get_observations'"));
+    expect(getObsSection).toContain("ids:");
+    expect(getObsSection).toContain("required:");
+  });
+});