Remove git MCP server: package doesn't exist on npm, git CLI suffices

@modelcontextprotocol/server-git is not published to npm (it's a
Python package). Agents already have git installed and can use it
directly, so the MCP wrapper is unnecessary.

apps/harness/Dockerfile

@@ -45,7 +45,6 @@ COPY --from=gitea-mcp-builder /usr/local/bin/gitea-mcp /usr/local/bin/gitea-mcp
 RUN npm install -g \
     @modelcontextprotocol/server-postgres \
     @modelcontextprotocol/server-filesystem \
-    @modelcontextprotocol/server-git \
     kubernetes-mcp-server
 
 RUN addgroup --system --gid 1001 nodejs

apps/harness/src/lib/mcp-config.ts

@@ -1,10 +1,23 @@
+import { existsSync } from "node:fs";
 import { mkdir, writeFile } from "node:fs/promises";
-import { join } from "node:path";
+import { join, resolve } from "node:path";
 import { getRawCredentialsByProvider } from "./credentials";
 import type { AgentRuntime } from "./agents";
 
 const DEFAULT_GITEA_URL = "http://gitea.platform.svc:3000";
 
+/** Resolve the harness MCP server script — prefer compiled bundle, fall back to source + tsx. */
+function resolveHarnessMcp(): { command: string; args: string[] } {
+  // Compiled bundle from `scripts/build-mcp.mjs` (production)
+  const bundled = resolve(__dirname, "../../dist/mcp-server.mjs");
+  if (existsSync(bundled)) {
+    return { command: "node", args: [bundled] };
+  }
+  // Source file via tsx (development)
+  const source = resolve(__dirname, "../mcp-server.ts");
+  return { command: "npx", args: ["tsx", source] };
+}
+
 interface McpServerDef {
   command: string;
   args: string[];
@@ -57,10 +70,16 @@ async function buildMcpServers(workDir: string): Promise<Record<string, McpServe
     args: [workDir],
   };
 
-  // ── Git: always (scoped to worktree) ──
+  // ── Harness: always (knowledge + task orchestration) ──
-  servers.git = {
+  const harnessEnv: Record<string, string> = {};
-    command: "mcp-server-git",
+  if (process.env.DATABASE_URL) harnessEnv.DATABASE_URL = process.env.DATABASE_URL;
-    args: ["--repository", workDir],
+  if (process.env.HARNESS_KNOWLEDGE_DIR) harnessEnv.HARNESS_KNOWLEDGE_DIR = process.env.HARNESS_KNOWLEDGE_DIR;
+
+  const harnessMcp = resolveHarnessMcp();
+  servers.harness = {
+    command: harnessMcp.command,
+    args: harnessMcp.args,
+    env: harnessEnv,
   };
 
   return servers;