Add module documentation and admin user name support (issue #1314)

[ako]

Summary

Implements support for reading and writing module documentation and project admin user name in MDL, addressing issue mendixlabs#1314. Previously, MDL could not set these properties even though lint rules (mendixlabs#1269) read them, leaving MDL-built apps with empty module documentation and default admin names.

Key Changes

• Module Documentation: A Mendix module has no documentation property of its own; its documentation is stored on DomainModels$DomainModel.Documentation. The doc comment on create module statements now sets this property, and describe module prints it back as a doc comment for round-tripping.

  • Added Documentation and DocumentationSet fields to CreateModuleStmt AST node
  • Added CreateOrModify field to distinguish create or modify module (applies docs to existing modules) from plain create module (no-op on existing modules)
  • Implemented setModuleDocumentation() to persist domain model documentation via backend
  • Updated describeModule() to emit domain model documentation as a doc comment
  • Parser now captures doc comments on module creation statements

• Project Admin User Name: Added support for renaming the built-in administrator account (default MxAdmin) via alter app security ( AdminUserName: '<name>' ).

  • Added AdminUserName field to AlterProjectSecurityStmt AST node
  • Implemented SetProjectAdminUserName() backend method in modelsdk
  • Updated security parser to accept AdminUserName as a valid property (deliberately excluding AdminPassword per fix(check): a gallery's template/filter block is a slot, not a CE0495 duplicate #624)
  • Added execution logic in execAlterProjectSecurity() to apply the change

• Backend Support:

  • Added SetDomainModelDocumentation() method to domain model backend interface and implementations
  • Added SetProjectAdminUserName() method to project security backend interface and implementations
  • Updated mock backend and unimplemented stubs to support both new methods

• Documentation & Examples:

  • Added comprehensive test cases covering module documentation round-tripping, empty comment clearing, and control cases
  • Added test case for admin user name setting
  • Added example MDL file (1314-module-documentation-and-admin-user-name.mdl) demonstrating both features
  • Updated syntax documentation and quick reference guides

Implementation Details

• An absent doc comment preserves the stored documentation (per MDL-BUTTON02: also flag own-container names in data sources and widget expressions #1018); an empty comment (/** */) clears it
• A plain create module of an existing module remains a no-op; only create or modify module applies documentation to existing modules
• The admin password is deliberately not exposed in MDL (per fix(check): a gallery's template/filter block is a slot, not a CE0495 duplicate #624); only the username can be changed
• All changes preserve existing stored values when not explicitly modified (e.g., other security properties remain unchanged when setting admin name)

https://claude.ai/code/session_01Uj8k5uUCi1zKZ3Edj8MZ8h