feat: split codex-common into smaller utils crates (#11422)

We are removing feature-gated shared crates from the `codex-rs`
workspace. `codex-common` grouped several unrelated utilities behind
`[features]`, which made dependency boundaries harder to reason about
and worked against the ongoing effort to eliminate feature flags from
workspace crates.

Splitting these utilities into dedicated crates under `utils/` aligns
this area with existing workspace structure and keeps each dependency
explicit at the crate boundary.

## What changed

- Removed `codex-rs/common` (`codex-common`) from workspace members and
workspace dependencies.
- Added six new utility crates under `codex-rs/utils/`:
  - `codex-utils-cli`
  - `codex-utils-elapsed`
  - `codex-utils-sandbox-summary`
  - `codex-utils-approval-presets`
  - `codex-utils-oss`
  - `codex-utils-fuzzy-match`
- Migrated the corresponding modules out of `codex-common` into these
crates (with tests), and added matching `BUILD.bazel` targets.
- Updated direct consumers to use the new crates instead of
`codex-common`:
  - `codex-rs/cli`
  - `codex-rs/tui`
  - `codex-rs/exec`
  - `codex-rs/app-server`
  - `codex-rs/mcp-server`
  - `codex-rs/chatgpt`
  - `codex-rs/cloud-tasks`
- Updated workspace lockfile entries to reflect the new dependency graph
and removal of `codex-common`.

codex-rs/cli/src/main.rs

@@ -16,7 +16,6 @@ use codex_cli::login::run_login_with_chatgpt;
 use codex_cli::login::run_login_with_device_code;
 use codex_cli::login::run_logout;
 use codex_cloud_tasks::Cli as CloudTasksCli;
-use codex_common::CliConfigOverrides;
 use codex_exec::Cli as ExecCli;
 use codex_exec::Command as ExecCommand;
 use codex_exec::ReviewArgs;
@@ -26,6 +25,7 @@ use codex_tui::AppExitInfo;
 use codex_tui::Cli as TuiCli;
 use codex_tui::ExitReason;
 use codex_tui::update_action::UpdateAction;
+use codex_utils_cli::CliConfigOverrides;
 use owo_colors::OwoColorize;
 use std::io::IsTerminal;
 use std::path::PathBuf;
@@ -1248,11 +1248,11 @@ mod tests {
         assert_eq!(interactive.config_profile.as_deref(), Some("my-profile"));
         assert_matches!(
             interactive.sandbox_mode,
-            Some(codex_common::SandboxModeCliArg::WorkspaceWrite)
+            Some(codex_utils_cli::SandboxModeCliArg::WorkspaceWrite)
         );
         assert_matches!(
             interactive.approval_policy,
-            Some(codex_common::ApprovalModeCliArg::OnRequest)
+            Some(codex_utils_cli::ApprovalModeCliArg::OnRequest)
         );
         assert!(interactive.full_auto);
         assert_eq!(