[codex] Revert shared BuildBuddy Bazel wrapper (#25909)

## Why

PR #25905 intentionally adds a failing `codex-core` unit test, but its
[Bazel test on Windows
check](https://github.com/openai/codex/actions/runs/26837526950/job/79135369259)
passed. That shows the Bazel configuration introduced by #25156 is not
behaving as expected, so revert it while the configuration can be
investigated separately.

## What changed

Revert #25156 in full, restoring the previous Bazel remote
configuration, CI scripts, workflows, `rusty_v8` handling, and
documentation. This removes the shared BuildBuddy wrapper and its tests.

## Validation

Not run locally; this exact revert was prioritized for a fast rollback.

.github/scripts/rusty_v8_bazel.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import argparse
 import gzip
 import hashlib
+import os
 import re
 import shutil
 import subprocess
@@ -12,7 +13,6 @@ import sys
 import tomllib
 from pathlib import Path
 
-from run_bazel_with_buildbuddy import bazel_command
 from rusty_v8_module_bazel import (
     RustyV8ChecksumError,
     check_module_bazel,
@@ -29,22 +29,33 @@ SANDBOX_ARTIFACT_PROFILE = "ptrcomp_sandbox_release"
 ARTIFACT_BAZEL_CONFIGS = ["rusty-v8-upstream-libcxx"]
 
 
+def bazel_remote_args() -> list[str]:
+    buildbuddy_api_key = os.environ.get("BUILDBUDDY_API_KEY")
+    if not buildbuddy_api_key:
+        return []
+    return [f"--remote_header=x-buildbuddy-api-key={buildbuddy_api_key}"]
+
+
 def bazel_execroot() -> Path:
-    output = subprocess.check_output(
-        bazel_command("info", "execution_root"),
+    result = subprocess.run(
+        ["bazel", "info", "execution_root"],
         cwd=ROOT,
+        check=True,
+        capture_output=True,
         text=True,
     )
-    return Path(output.strip())
+    return Path(result.stdout.strip())
 
 
 def bazel_output_base() -> Path:
-    output = subprocess.check_output(
-        bazel_command("info", "output_base"),
+    result = subprocess.run(
+        ["bazel", "info", "output_base"],
         cwd=ROOT,
+        check=True,
+        capture_output=True,
         text=True,
     )
-    return Path(output.strip())
+    return Path(result.stdout.strip())
 
 
 def bazel_output_path(path: str) -> Path:
@@ -61,22 +72,24 @@ def bazel_output_files(
 ) -> list[Path]:
     expression = "set(" + " ".join(labels) + ")"
     bazel_configs = bazel_configs or []
-    output = subprocess.check_output(
-        bazel_command(
+    result = subprocess.run(
+        [
+            "bazel",
             "cquery",
             "-c",
             compilation_mode,
             f"--platforms=@llvm//platforms:{platform}",
             *[f"--config={config}" for config in bazel_configs],
+            *bazel_remote_args(),
             "--output=files",
             expression,
-        ),
+        ],
         cwd=ROOT,
+        check=True,
+        capture_output=True,
         text=True,
     )
-    return [
-        bazel_output_path(line.strip()) for line in output.splitlines() if line.strip()
-    ]
+    return [bazel_output_path(line.strip()) for line in result.stdout.splitlines() if line.strip()]
 
 
 def bazel_build(
@@ -89,15 +102,17 @@ def bazel_build(
     bazel_configs = bazel_configs or []
     download_args = ["--remote_download_toplevel"] if download_toplevel else []
     subprocess.run(
-        bazel_command(
+        [
+            "bazel",
             "build",
             "-c",
             compilation_mode,
             f"--platforms=@llvm//platforms:{platform}",
             *[f"--config={config}" for config in bazel_configs],
+            *bazel_remote_args(),
             *download_args,
             *labels,
-        ),
+        ],
         cwd=ROOT,
         check=True,
     )
@@ -157,7 +172,7 @@ def resolved_v8_crate_version() -> str:
     matches = sorted(
         set(
             re.findall(
-                r"https://static\.crates\.io/crates/v8/v8-([0-9]+\.[0-9]+\.[0-9]+)\.crate",
+                r'https://static\.crates\.io/crates/v8/v8-([0-9]+\.[0-9]+\.[0-9]+)\.crate',
                 module_bazel,
             )
         )
@@ -219,17 +234,13 @@ def stage_artifacts(
     output_dir: Path,
     sandbox: bool,
 ) -> None:
-    missing_paths = [
-        str(path) for path in [lib_path, binding_path] if not path.exists()
-    ]
+    missing_paths = [str(path) for path in [lib_path, binding_path] if not path.exists()]
     if missing_paths:
         raise SystemExit(f"missing release outputs for {target}: {missing_paths}")
 
     output_dir.mkdir(parents=True, exist_ok=True)
     artifact_profile = SANDBOX_ARTIFACT_PROFILE if sandbox else RELEASE_ARTIFACT_PROFILE
-    staged_library = output_dir / staged_archive_name(
-        target, lib_path, artifact_profile
-    )
+    staged_library = output_dir / staged_archive_name(target, lib_path, artifact_profile)
     staged_binding = output_dir / staged_binding_name(target, artifact_profile)
 
     with lib_path.open("rb") as src, staged_library.open("wb") as dst:
@@ -259,9 +270,7 @@ def stage_artifacts(
 
 
 def upstream_release_pair_paths(source_root: Path, target: str) -> tuple[Path, Path]:
-    lib_name = (
-        "rusty_v8.lib" if target.endswith("-pc-windows-msvc") else "librusty_v8.a"
-    )
+    lib_name = "rusty_v8.lib" if target.endswith("-pc-windows-msvc") else "librusty_v8.a"
     gn_out = source_root / "target" / target / "release" / "gn_out"
     return gn_out / "obj" / lib_name, gn_out / "src_binding.rs"
 
@@ -329,9 +338,7 @@ def parse_args() -> argparse.Namespace:
     stage_upstream_release_pair_parser = subparsers.add_parser(
         "stage-upstream-release-pair"
     )
-    stage_upstream_release_pair_parser.add_argument(
-        "--source-root", type=Path, required=True
-    )
+    stage_upstream_release_pair_parser.add_argument("--source-root", type=Path, required=True)
     stage_upstream_release_pair_parser.add_argument("--target", required=True)
     stage_upstream_release_pair_parser.add_argument("--output-dir", required=True)
     stage_upstream_release_pair_parser.add_argument("--sandbox", action="store_true")