Spread AbsolutePathBuf (#17792)

Mechanical change to promote absolute paths through code.

codex-rs/Cargo.lock

@@ -1375,6 +1375,7 @@ dependencies = [
  "codex-login",
  "codex-plugin",
  "codex-protocol",
+ "codex-utils-absolute-path",
  "os_info",
  "pretty_assertions",
  "serde",
@@ -2236,6 +2237,7 @@ dependencies = [
  "chrono",
  "codex-config",
  "codex-protocol",
+ "codex-utils-absolute-path",
  "futures",
  "pretty_assertions",
  "regex",
@@ -2385,6 +2387,7 @@ dependencies = [
  "codex-models-manager",
  "codex-protocol",
  "codex-shell-command",
+ "codex-utils-absolute-path",
  "codex-utils-cli",
  "codex-utils-json-to-toml",
  "core_test_support",