Redact command environment variables from log output (#32985)

Before/After (linebreaks added for readability)
```log 
# before
INFO  [project::context_server_store::extension]
loaded command for context server mcp-server-github:
Command { 
  command: "/Users/peter/Library/Application Support/Zed/extensions/work/mcp-server-github/github-mcp-server-v0.5.0/github-mcp-server", 
  args: ["stdio"], 
  env: [("GITHUB_PERSONAL_ACCESS_TOKEN", "gho_WOOOOOOOOOOOOOOO")] 
}

#after
INFO  [project::context_server_store::extension]
loaded command for context server mcp-server-github:
Command {
  command: "/Users/peter/Library/Application Support/Zed/extensions/work/mcp-server-github/github-mcp-server-v0.5.0/github-mcp-server",
  args: ["stdio"],
  env: [("GITHUB_PERSONAL_ACCESS_TOKEN", "[REDACTED]")]
}
```

Release Notes:

- Redact sensitive environment variables from MCP logs

crates/context_server/src/context_server.rs

@@ -16,6 +16,7 @@ use gpui::AsyncApp;
 use parking_lot::RwLock;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
+use util::redact::should_redact;
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct ContextServerId(pub Arc<str>);
@@ -26,13 +27,29 @@ impl Display for ContextServerId {
     }
 }
 
-#[derive(Deserialize, Serialize, Clone, PartialEq, Eq, JsonSchema, Debug)]
+#[derive(Deserialize, Serialize, Clone, PartialEq, Eq, JsonSchema)]
 pub struct ContextServerCommand {
     pub path: String,
     pub args: Vec<String>,
     pub env: Option<HashMap<String, String>>,
 }
 
+impl std::fmt::Debug for ContextServerCommand {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let filtered_env = self.env.as_ref().map(|env| {
+            env.iter()
+                .map(|(k, v)| (k, if should_redact(k) { "[REDACTED]" } else { v }))
+                .collect::<Vec<_>>()
+        });
+
+        f.debug_struct("ContextServerCommand")
+            .field("path", &self.path)
+            .field("args", &self.args)
+            .field("env", &filtered_env)
+            .finish()
+    }
+}
+
 enum ContextServerTransport {
     Stdio(ContextServerCommand),
     Custom(Arc<dyn crate::transport::Transport>),