build(python): simplify rpycdec vendor layout

third_party/python/BUILD.bazel

@@ -1,10 +1,11 @@
-load("@rules_python//python:defs.bzl", "py_binary")
+load("@rules_python//python:defs.bzl", "py_binary", "py_library")
 
 package(default_visibility = ["//visibility:public"])
 
-alias(
+py_library(
     name = "rpycdec",
-    actual = "//third_party/python/rpycdec-0.1.13+489e9c6:rpycdec",
+    srcs = glob(["rpycdec/src/**/*.py"]),
+    imports = ["rpycdec/src"],
 )
 
 py_binary(

third_party/python/README.md

@@ -3,26 +3,25 @@
 This package exposes vendored Python dependencies through stable public Bazel targets.
 Bazel uses `PYTHON_TOOLCHAIN_ROOT` to find the monorepo `python3` runtime.
 
-Project code depends on aliases in `//third_party/python`.
+Project code depends on targets in `//third_party/python`.
-It does not depend on versioned package directories directly.
+It does not depend on files inside vendored source directories directly.
 
 Use this layout for a vendored package:
 
 ```text
 third_party/python/
   BUILD.bazel
-  <name>-<version>/
+  <name>/
-    BUILD.bazel
     LICENSE
     pyproject.toml
     src/
 ```
 
-Use the upstream package name for public aliases.
+Use the upstream package name for library targets.
 For command-line tools, add a `_bin` suffix to the binary target.
 
 Preserve upstream license files and package metadata.
-Keep repository Bazel files separate from upstream source when possible.
+Keep repository Bazel files outside upstream source when possible.
 
 Add optional dependencies as separate public targets.
 Do not bundle optional dependencies into the primary package target.
@@ -34,7 +33,7 @@ Ariadne uses the game-bundled Ren'Py runtime for AST export.
 
 The vendored source comes from `cnfatal/rpycdec` at commit `489e9c6b8a48ed7904d7039d7787c36a03c75fe3`.
 
-The intended public targets are:
+The public targets are:
 
 ```text
 //third_party/python:rpycdec

third_party/python/rpycdec-0.1.13+489e9c6/BUILD.bazel

@@ -1,9 +0,0 @@
-load("@rules_python//python:defs.bzl", "py_library")
-
-package(default_visibility = ["//third_party/python:__pkg__"])
-
-py_library(
-    name = "rpycdec",
-    srcs = glob(["src/**/*.py"]),
-    imports = ["src"],
-)