Get terminal tool working in evals (#29831)

Bypass our terminal subsystem and just run a shell in a pty.

- [x] make sure we use the same working directory
- [x] strip control chars from the pty output (?)
- [x] tests

Release Notes:

- N/A

Cargo.lock

@@ -736,6 +736,8 @@ dependencies = [
  "language_models",
  "linkme",
  "open",
+ "paths",
+ "portable-pty",
  "pretty_assertions",
  "project",
  "rand 0.8.5",
@@ -762,6 +764,7 @@ dependencies = [
  "workspace",
  "workspace-hack",
  "zed_llm_client",
+ "zlog",
 ]
 
 [[package]]
@@ -3991,7 +3994,7 @@ version = "3.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "697b5419f348fd5ae2478e8018cb016c00a5881c7f46c717de98ffd135a5651c"
 dependencies = [
- "nix",
+ "nix 0.29.0",
  "windows-sys 0.59.0",
 ]
 
@@ -9076,6 +9079,18 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "nix"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab2156c4fce2f8df6c499cc1c763e4394b7482525bf2a9701c9d79d215f519e4"
+dependencies = [
+ "bitflags 2.9.0",
+ "cfg-if",
+ "cfg_aliases 0.1.1",
+ "libc",
+]
+
 [[package]]
 name = "nix"
 version = "0.29.0"
@@ -10899,6 +10914,27 @@ dependencies = [
  "portable-atomic",
 ]
 
+[[package]]
+name = "portable-pty"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4a596a2b3d2752d94f51fac2d4a96737b8705dddd311a32b9af47211f08671e"
+dependencies = [
+ "anyhow",
+ "bitflags 1.3.2",
+ "downcast-rs",
+ "filedescriptor",
+ "lazy_static",
+ "libc",
+ "log",
+ "nix 0.28.0",
+ "serial2",
+ "shared_library",
+ "shell-words",
+ "winapi",
+ "winreg 0.10.1",
+]
+
 [[package]]
 name = "postage"
 version = "0.5.0"
@@ -13310,6 +13346,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serial2"
+version = "0.2.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7d1d08630509d69f90eff4afcd02c3bd974d979225cbd815ff5942351b14375"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "session"
 version = "0.1.0"
@@ -13410,6 +13457,16 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "shared_library"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a9e7e0f2bfae24d8a5b5a66c5b257a83c7412304311512a0c054cd5e619da11"
+dependencies = [
+ "lazy_static",
+ "libc",
+]
+
 [[package]]
 name = "shell-words"
 version = "1.1.0"
@@ -17764,6 +17821,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "winreg"
 version = "0.50.0"
@@ -18216,7 +18282,7 @@ dependencies = [
  "miniz_oxide",
  "mio",
  "naga",
- "nix",
+ "nix 0.29.0",
  "nom",
  "num-bigint",
  "num-bigint-dig",
@@ -18593,7 +18659,7 @@ dependencies = [
  "futures-core",
  "futures-lite 2.6.0",
  "hex",
- "nix",
+ "nix 0.29.0",
  "ordered-stream",
  "serde",
  "serde_repr",
@@ -18706,7 +18772,7 @@ dependencies = [
  "menu",
  "migrator",
  "mimalloc",
- "nix",
+ "nix 0.29.0",
  "node_runtime",
  "notifications",
  "outline",