feat(playground): schema-driven dynamic args form for the Run tab

.gitattributes

@@ -8,6 +8,9 @@
 # Force LF line endings for .baml files so include_str! embeds consistent
 # content on all platforms (avoids CRLF line-number shifts on Windows CI).
 *.baml text eol=lf
+# Same for the args-form wire-shape golden fixture, byte-compared against
+# serde_json output by baml_project's wire_shape_matches_the_ts_golden_fixture.
+typescript2/pkg-playground/src/__fixtures__/*.json text eol=lf
 # Force LF for the checked-in SSE replay recordings. The BAML replay server
 # chunks them for paced streaming with `split("\n\n")`; CRLF (from autocrlf
 # on Windows) turns every "\n\n" into "\r\n\r\n", so the whole body streams

baml_language/crates/baml_project/Cargo.toml

@@ -36,6 +36,7 @@ la-arena = { workspace = true }
 lsp-types = { workspace = true }
 salsa = { workspace = true }
 serde = { workspace = true, features = [ "derive" ] }
+serde_json = { workspace = true }
 text-size = { workspace = true }
 
 [features]

baml_language/crates/baml_project/src/lib.rs

@@ -25,6 +25,7 @@ mod check;
 mod client_codegen;
 mod db;
 
+pub mod param_schema;
 pub mod position;
 pub mod symbols;
 #[cfg(feature = "testing")]
@@ -33,7 +34,8 @@ pub mod testing;
 pub use check::{CheckResult, collect_compiler2_diagnostics, collect_diagnostics};
 pub use client_codegen::build_symbol_pool;
 pub use db::{CursorContext, EventCallback, ProjectDatabase};
+pub use param_schema::{FieldSchema, FieldSchemaField, ParamSchema, TypeSchema};
 pub use symbols::{
-    FunctionOrigin, FunctionSymbol, Symbol, SymbolKind, TestSymbol, list_functions,
-    list_functions_with_metadata, list_tests_with_metadata,
+    FunctionListing, FunctionOrigin, FunctionSymbol, Symbol, SymbolKind, TestSymbol,
+    list_functions, list_functions_with_metadata, list_tests_with_metadata,
 };