Add system prompt and tool permission to agent2 (#35781)

Release Notes:

- N/A

---------

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

Cargo.lock

@@ -138,9 +138,9 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol"
-version = "0.0.20"
+version = "0.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12dbfec3d27680337ed9d3064eecafe97acf0b0f190148bb4e29d96707c9e403"
+checksum = "b7ae3c22c23b64a5c3b7fc8a86fcc7c494e989bd2cd66fdce14a58cfc8078381"
 dependencies = [
  "anyhow",
  "futures 0.3.31",
@@ -159,6 +159,7 @@ dependencies = [
  "agent-client-protocol",
  "agent_servers",
  "anyhow",
+ "assistant_tool",
  "client",
  "clock",
  "cloud_llm_client",
@@ -171,10 +172,12 @@ dependencies = [
  "gpui_tokio",
  "handlebars 4.5.0",
  "indoc",
+ "language",
  "language_model",
  "language_models",
  "log",
  "project",
+ "prompt_store",
  "reqwest_client",
  "rust-embed",
  "schemars",
@@ -185,6 +188,7 @@ dependencies = [
  "ui",
  "util",
  "uuid",
+ "watch",
  "workspace-hack",
  "worktree",
 ]