[codex] Remove unused legacy shell tools (#22246)

## Why

Recent session history showed no active use of the raw `shell`,
`local_shell`, or `container.exec` execution surfaces. Keeping those
handlers/specs wired into core leaves duplicate shell execution paths
alongside the supported `shell_command` and unified exec tools.

## What changed

- Removed the raw `shell` handler/spec and its `ShellToolCallParams`
protocol helper.
- Removed the legacy `local_shell` and `container.exec` handler/spec
plumbing while preserving persisted-history compatibility for old
response items.
- Normalized model/config `default` and `local` shell selections to
`shell_command`.
- Pruned tests that exercised removed raw-shell/local-shell/apply-patch
variants and kept coverage on `shell_command`, unified exec, and
freeform `apply_patch`.

## Verification

- `git diff --check`
- `cargo test -p codex-protocol`
- `cargo test -p codex-tools`
- `cargo test -p codex-core tools::handlers::shell`
- `cargo test -p codex-core tools::spec`
- `cargo test -p codex-core tools::router`
- `cargo test -p codex-core
active_call_preserves_triggering_command_context`
- `cargo test -p codex-core guardian_tests`
- `cargo test -p codex-core --test all shell_serialization`
- `cargo test -p codex-core --test all apply_patch_cli`
- `cargo test -p codex-core --test all shell_command_`
- `cargo test -p codex-core --test all local_shell`
- `cargo test -p codex-core --test all otel::`
- `cargo test -p codex-core --test all hooks::`
- `just fix -p codex-core`
- `just fix -p codex-tools`

codex-rs/tools/src/tool_payload.rs

@@ -1,7 +1,6 @@
 use std::borrow::Cow;
 
 use codex_protocol::models::SearchToolCallParams;
-use codex_protocol::models::ShellToolCallParams;
 
 /// Canonical payload shapes accepted by model-visible tool runtimes.
 #[derive(Clone, Debug)]
@@ -9,7 +8,6 @@ pub enum ToolPayload {
     Function { arguments: String },
     ToolSearch { arguments: SearchToolCallParams },
     Custom { input: String },
-    LocalShell { params: ShellToolCallParams },
 }
 
 impl ToolPayload {
@@ -18,7 +16,6 @@ impl ToolPayload {
             ToolPayload::Function { arguments } => Cow::Borrowed(arguments),
             ToolPayload::ToolSearch { arguments } => Cow::Owned(arguments.query.clone()),
             ToolPayload::Custom { input } => Cow::Borrowed(input),
-            ToolPayload::LocalShell { params } => Cow::Owned(params.command.join(" ")),
         }
     }
 }