doc fixes + propogate errors for baml-cli (#2124)

<!-- ELLIPSIS_HIDDEN -->



> [!IMPORTANT]
> Enhance CLI error handling and update BAML documentation for Ruby and
TypeScript with improved examples and structure.
> 
>   - **CLI Error Handling**:
> - Propagate errors in `commands.rs` for `Generate`, `Init`, `Serve`,
`Dev`, `Auth`, `Login`, `Deploy` commands by printing error messages to
stderr.
>   - **Protobuf Changes**:
> - Update `cffi.pb.go` to include `sizeCache` and `unknownFields` in
`CFFIValueHolder`, `CFFIFieldTypeChecked`, and `CFFICollector`.
> - Conditional `protoimpl.UnsafeEnabled` checks added for message state
handling in `CFFIValueChecked` and `CFFICollector`.
>   - **Documentation Updates**:
> - Replace `<CodeBlocks>` with `<Tabs>` in `ruby.mdx` and
`typescript.mdx` for better code example organization.
> - Add streaming examples for Ruby and TypeScript in `ruby.mdx` and
`typescript.mdx`.
> - Update `checks-and-asserts.mdx` to include detailed examples of
`@assert` and `@check` usage.
>     - Add examples for async and sync client usage in `client.mdx`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for 77c0ea1. You can
[customize](https://app.ellipsis.dev/BoundaryML/settings/summaries) this
summary. It will automatically update as commits are pushed.</sup>

<!-- ELLIPSIS_HIDDEN -->

Author: egol

engine/cli/src/commands.rs

@@ -60,40 +60,61 @@ impl RuntimeCli {
                 args.from = BamlRuntime::parse_baml_src_path(&args.from)?;
                 match args.run(defaults) {
                     Ok(()) => Ok(crate::ExitCode::Success),
-                    Err(_) => Ok(crate::ExitCode::Other),
+                    Err(e) => {
+                        eprintln!("Error: {e}");
+                        Ok(crate::ExitCode::Other)
+                    }
                 }
             }
             Commands::Init(args) => match args.run(defaults) {
                 Ok(()) => Ok(crate::ExitCode::Success),
-                Err(_) => Ok(crate::ExitCode::Other),
+                Err(e) => {
+                    eprintln!("Error: {e}");
+                    Ok(crate::ExitCode::Other)
+                }
             },
             Commands::Serve(args) => {
                 args.from = BamlRuntime::parse_baml_src_path(&args.from)?;
                 match args.run() {
                     Ok(()) => Ok(crate::ExitCode::Success),
-                    Err(_) => Ok(crate::ExitCode::Other),
+                    Err(e) => {
+                        eprintln!("Error: {e}");
+                        Ok(crate::ExitCode::Other)
+                    }
                 }
             }
             Commands::Dev(args) => {
                 args.from = BamlRuntime::parse_baml_src_path(&args.from)?;
                 match args.run(defaults) {
                     Ok(()) => Ok(crate::ExitCode::Success),
-                    Err(_) => Ok(crate::ExitCode::Other),
+                    Err(e) => {
+                        eprintln!("Error: {e}");
+                        Ok(crate::ExitCode::Other)
+                    }
                 }
             }
             Commands::Auth(args) => match t.block_on(async { args.run_async().await }) {
                 Ok(()) => Ok(crate::ExitCode::Success),
-                Err(_) => Ok(crate::ExitCode::Other),
+                Err(e) => {
+                    eprintln!("Error: {e}");
+                    Ok(crate::ExitCode::Other)
+                }
             },
             Commands::Login(args) => match t.block_on(async { args.run_async().await }) {
                 Ok(()) => Ok(crate::ExitCode::Success),
-                Err(_) => Ok(crate::ExitCode::Other),
+                Err(e) => {
+                    eprintln!("Error: {e}");
+                    Ok(crate::ExitCode::Other)
+                }
             },
             Commands::Deploy(args) => {
                 args.from = BamlRuntime::parse_baml_src_path(&args.from)?;
                 match t.block_on(async { args.run_async().await }) {
                     Ok(()) => Ok(crate::ExitCode::Success),
-                    Err(_) => Ok(crate::ExitCode::Other),
+                    Err(e) => {
+                        eprintln!("Error: {e}");
+                        Ok(crate::ExitCode::Other)
+                    }
                 }
             }
             Commands::Format(args) => {

engine/language_client_codegen/src/version_check.rs

@@ -101,7 +101,7 @@ pub fn check_version(
             let update_instruction = match generator_language {
                 GeneratorOutputType::OpenApi => format!("use 'npx @boundaryml/baml@{gen_version}'"),
                 GeneratorOutputType::PythonPydantic | GeneratorOutputType::PythonPydanticV1 => {
-                    format!("pip install --upgrade baml-py=={gen_version}")
+                    format!("pip install --upgrade baml-py=={gen_version}, or uv add baml-py=={gen_version}")
                 }
                 GeneratorOutputType::Typescript => {
                     format!("npm install --save-dev @boundaryml/baml@{gen_version}")