Clean up dead code, fix type errors, and add publish workflow

Remove unused _append_ops_call_method, fix _property_data_from_member
call signature, replace sys.version_info guard with hasattr check for
__buffer__ protocol, fix implicit string concatenations, add msgbus
overrides for 4.0-4.4, add conformance tests, and add publish script.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -63,7 +63,7 @@ gpu.state.blend_set('ALPHA')
 - **Typed `Context.copy()`** — returns a `ContextDict` TypedDict instead of `dict[str, object]`, so unpacking into `context.temp_override(**ctx)` type-checks correctly
 - **Dynamic array types** — `Image.pixels` typed as `bpy_prop_array[float]` (not `list[float]` or `float`)
 - **Zero `Any` usage** — precise types throughout, no `typing.Any` fallbacks
-- **basedpyright strict mode** — 0 errors on generated stubs (4.1+)
+- **[basedpyright](https://docs.basedpyright.com) `all` mode** — 0 errors on generated stubs (4.0+), validated with `typeCheckingMode: "all"` (the strictest setting)
 
 ## How It Works
 
@@ -91,7 +91,7 @@ The introspection data is then passed through a stub generator that handles type
 | Constructor `__init__`   | Yes (mathutils, gpu, etc.) | No                            |
 | Literal enum types       | Yes                        | Yes (via stub_internal)       |
 | Context members          | ~100 typed                 | ~100 typed                    |
-| basedpyright strict      | 0 errors (4.1+)            | Not tested                    |
+| basedpyright `all` mode  | 0 errors (4.0+)            | Not tested                    |
 | Docstrings               | Yes                        | Yes                           |
 
 ### vs [bpystubgen](https://github.com/mysticfall/bpystubgen)