Refactor build system and implement complete renderer system

- Split monolithic build.rs into modular async generators
- Add renderer override system with type-safe dispatch
- Implement command template macro for consistent command definitions
- Add proc-macro crates for command and renderer systems
- Reorganize directory structure for better separation of concerns
- Update documentation to reflect new architecture

1 files changed, 12 insertions, 0 deletions

diff --git a/src/systems/cmd/errors.rs b/src/systems/cmd/errors.rs
index 358d15a..7ec5e1c 100644
--- a/src/systems/cmd/errors.rs
+++ b/src/systems/cmd/errors.rs
@@ -76,6 +76,12 @@ pub enum CmdRenderError {
 
     #[error("Renderer `{0}` not found")]
     RendererNotFound(String),
+
+    #[error("Type mismatch: expected `{expected:?}`, got `{actual:?}`")]
+    TypeMismatch {
+        expected: std::any::TypeId,
+        actual: std::any::TypeId,
+    },
 }
 
 impl CmdRenderError {
@@ -109,6 +115,12 @@ pub enum CmdProcessError {
 
     #[error("Parse error")]
     ParseError(String),
+
+    #[error("Renderer override mode is active, but user requested help")]
+    RendererOverrideButRequestHelp,
+
+    #[error("Downcast failed")]
+    DowncastFailed,
 }
 
 impl CmdProcessError {