Files and packages

• Source files use the .aes extension and live under scripts/ in the project. Any directory under scripts/ is a package; files in one directory belong to one package.
• The package path is project.module + "/" + directory (mygame/player). The package clause must equal the directory's base name (package player); a mismatch is AES4001.
• A module path uses [a-z0-9_/-] only, no dots: qualified names (mygame/player.State) are split on the last dot.
• import works as in Go; there are no import aliases. Importing a package that is not under scripts/ and not a host module is AES4002; cycles are AES4005. Unused imports are warnings.
• Host modules (aego/input, mygame/combat) and script packages share one namespace. A script directory whose package path equals a host module path is AES4010. The aego/ prefix is reserved for the standard library; module = "aego" is a project error.
• Visibility follows Go: identifiers starting with an uppercase letter are exported from the package; everything else is package-private. @export is unrelated to visibility (see §8).
• *_test.aes files are compiled only by aego test.

A package that fails to compile keeps its last good build; its files are marked invalid and Play is blocked until they compile again.