style(tsconvert): enforce two-space indentation for TypeScript interfaces

- Add two spaces before each field in generated interfaces
- Use newlines between fields and closing brace for proper formatting
- Update test to validate proper indentation
- Document test requirements in AGENTS.md

AGENTS.md

@@ -100,6 +100,14 @@ functions.RegisterAsyncFunction[FetchArgs, *FetchResult]("fetch", Fetch)
 - **Linting**: `golangci-lint run` - must pass before committing
 - **Test organization**: Test files use `_test.go` suffix, test functions prefixed with `Test`
 - **TypeScript test files**: Tests that require TypeScript files should create them inline using `os.CreateTemp()` instead of relying on external test files
+- **CRITICAL**: You must run `go test ./...` after any code change to validate that tests pass before committing
+
+## Test Requirements
+
+Before any commit, ensure:
+1. All tests pass: `go test ./...`
+2. All linting passes: `golangci-lint run`
+3. Type declarations are properly formatted (two spaces indentation)
 
 ## Dependencies