Remove the legacy exec policy engine (#32093)

## What changed

- Delete the `codex-execpolicy-legacy` crate, its default policy, and its tests.
- Remove the crate from the Cargo and Bazel workspaces and clean up its unused dependencies.
- Remove the legacy matcher reference from the current exec policy documentation.

GitOrigin-RevId: ee756958b46bf759ad43dec8aa1379c1cd4d8b0d

codex-rs/Cargo.lock

@@ -2980,26 +2980,6 @@ dependencies = [
  "thiserror 2.0.18",
 ]
 
-[[package]]
-name = "codex-execpolicy-legacy"
-version = "0.0.0"
-dependencies = [
- "allocative",
- "anyhow",
- "clap",
- "derive_more 2.1.1",
- "env_logger",
- "log",
- "multimap",
- "path-absolutize",
- "regex-lite",
- "serde",
- "serde_json",
- "serde_with",
- "starlark",
- "tempfile",
-]
-
 [[package]]
 name = "codex-experimental-api-macros"
 version = "0.0.0"
@@ -5886,7 +5866,6 @@ dependencies = [
  "anstream",
  "anstyle",
  "env_filter",
- "jiff",
  "log",
 ]
 
@@ -10142,24 +10121,6 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b867cad97c0791bbd3aaa6472142568c6c9e8f71937e98379f584cfb0cf35bec"
 
-[[package]]
-name = "path-absolutize"
-version = "3.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e4af381fe79fa195b4909485d99f73a80792331df0625188e707854f0b3383f5"
-dependencies = [
- "path-dedot",
-]
-
-[[package]]
-name = "path-dedot"
-version = "3.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07ba0ad7e047712414213ff67533e6dd477af0a4e1d14fb52343e53d30ea9397"
-dependencies = [
- "once_cell",
-]
-
 [[package]]
 name = "pathdiff"
 version = "0.2.3"