docs: add changelog for v0.2.0

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Source: https://github.com/getlumos/lumos/releases/tag/v0.2.0

Author: github-actions[bot]

src/content/docs/changelog/v020.md

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+---
+title: "v0.2.0 - Type Aliases & Multi-File Imports"
+description: "Release notes for LUMOS v0.2.0"
+date: 2025-11-24
+---
+
+## 🎉 LUMOS v0.2.0 - Type Aliases & Multi-File Imports
+
+Major release bringing schema organization and DRY principles to LUMOS!
+
+### ✨ New Features
+
+#### Type Aliases
+- Rust-style syntax: `type UserId = PublicKey;`
+- Recursive resolution with circular reference detection
+- Generate `pub type` (Rust) and `export type` (TypeScript)
+- Support for all types: primitives, Solana types, collections
+
+#### Multi-File Imports  
+- JavaScript-style syntax: `import { Type1, Type2 } from "./file.lumos";`
+- Automatic import discovery and resolution
+- Multi-line import support
+- Circular import detection
+- Cross-file type validation
+
+#### FileResolver Architecture
+- 340-line multi-file schema manager
+- Automatic dependency discovery
+- Import caching
+- Three-pass validation (collect → resolve → validate)
+
+### 📦 Installation
+
+```bash
+# Install or upgrade CLI
+cargo install lumos-cli@0.2.0
+
+# Or update existing installation
+cargo install --force lumos-cli
+```
+
+### 📚 Examples
+
+**Type Aliases:**
+```lumos
+type UserId = PublicKey;
+type Lamports = u64;
+type UserList = [PublicKey];
+
+struct Account {
+    owner: UserId,
+    balance: Lamports,
+}
+```
+
+**Multi-File Imports:**
+```lumos
+// types.lumos
+type UserId = PublicKey;
+enum AccountStatus { Active, Frozen, Closed }
+
+// accounts.lumos
+import { UserId, AccountStatus } from "./types.lumos";
+
+struct UserAccount {
+    user: UserId,
+    status: AccountStatus,
+}
+```
+
+### 🧪 Testing
+
+- ✅ All 202 tests passing (100% success)
+- ✅ E2E compilation verified
+- ✅ 4 new file_resolver tests
+
+### 📖 Documentation
+
+- Comprehensive examples in `examples/type_aliases.lumos` (200+ lines)
+- Multi-file examples in `examples/imports/` (7 files)
+- Complete usage guide and troubleshooting
+
+### 🔗 Links
+
+- **Changelog:** [CHANGELOG.md](https://github.com/getlumos/lumos/blob/main/CHANGELOG.md)
+- **crates.io:** [lumos-core](https://crates.io/crates/lumos-core), [lumos-cli](https://crates.io/crates/lumos-cli), [lumos-lsp](https://crates.io/crates/lumos-lsp)
+- **Documentation:** https://lumos-lang.org
+
+### 🚀 What's Next
+
+Phase 5.3 continues with:
+- Nested module support (#53)
+- Generic struct/enum definitions (#54)
+
+**Phase 5.3 Progress: 60% complete (3/5 issues)**
+
+---
+
+Alhamdulillah! Thank you to everyone supporting LUMOS development. 🎉
+
+---
+
+**Links:**
+- [GitHub Release](https://github.com/getlumos/lumos/releases/tag/v0.2.0)
+- [Compare changes](https://github.com/getlumos/lumos/compare/db6779ba462975926a6b469578f2d17dc7427e8f...v0.2.0)