chore: release 0.3.0 with idx-mcp

Bump the workspace and npm packages to 0.3.0. The release workflow
builds and attaches idx-mcp binaries next to idx, the npm launcher and
installer pick their binary from package.json so npm/idx-mcp reuses
them, and the npm smoke test covers both packages.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

npm/idx-mcp/.gitignore

@@ -0,0 +1 @@
+scripts/

npm/idx-mcp/README.md

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+# idx-mcp
+
+MCP server (stdio) for Indonesian stock market (IDX) data: quotes, price
+history, screener, company financials, analysis, and KSEI shareholder
+ownership. This package downloads the native `idx-mcp` binary for your
+platform from the matching GitHub release and verifies its SHA-256.
+
+```bash
+claude mcp add idx -- npx -y idx-mcp
+```
+
+See https://github.com/0xrsydn/idx-cli#mcp-server for the tools and options.

npm/idx-mcp/package.json

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+{
+  "name": "idx-mcp",
+  "version": "0.3.0",
+  "description": "MCP server for Indonesian stock market (IDX) market, financial, and ownership data",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xrsydn/idx-cli.git",
+    "directory": "npm/idx-mcp"
+  },
+  "homepage": "https://github.com/0xrsydn/idx-cli",
+  "keywords": [
+    "idx",
+    "stocks",
+    "indonesia",
+    "finance",
+    "mcp"
+  ],
+  "engines": {
+    "node": ">=16"
+  },
+  "nativeBinary": "idx-mcp",
+  "bin": {
+    "idx-mcp": "./scripts/idx.js"
+  },
+  "files": [
+    "scripts/idx.js",
+    "scripts/install.js"
+  ],
+  "scripts": {
+    "prepack": "mkdir -p scripts && cp ../../scripts/idx.js ../../scripts/install.js scripts/",
+    "postinstall": "node scripts/install.js"
+  }
+}