address review: use jemallocator feature name and mutually exclusive cfg guards

- Switch all cfg guards from feature = "tikv-jemallocator" to
  feature = "jemallocator" (the public crate feature name)
- Make allocator cfg guards mutually exclusive with not() clauses
  so only compile_error! fires when both features are enabled
- Clarify env vars docs that allocator-specific vars are build-dependent
- Fix Polars badge markdown line break in README.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jqnatividad

README.md

@@ -105,8 +105,7 @@
 🧠: expensive operations are memoized with available inter-session Redis/Disk caching for fetch commands.  
 🗄️: [Extended input support](#extended-input-support).  
 🗃️: [Limited Extended input support](#limited-extended-input-support).  
-🐻‍❄️: command powered/accelerated by [![polars 0.53.0:py_1.39.3:bb93ba8](https://img.shields.io/badge/polars-0.53.0:py_1.39.3_bb93ba8-blue?logo=polars
-)](https://github.com/pola-rs/polars/releases/tag/py-1.39.3) vectorized query engine.  
+🐻‍❄️: command powered/accelerated by [![polars 0.53.0:py_1.39.3:bb93ba8](https://img.shields.io/badge/polars-0.53.0:py_1.39.3_bb93ba8-blue?logo=polars)](https://github.com/pola-rs/polars/releases/tag/py-1.39.3) vectorized query engine.  
 🤖: command uses Natural Language Processing or Generative AI.  
 🏎️: multithreaded and/or faster when an index (📇) is available.  
 🚀: multithreaded even without an index.  

docs/ENVIRONMENT_VARIABLES.md

@@ -78,7 +78,7 @@ Several dependencies also have environment variables that influence qsv's perfor
   * `POLARS_BACKTRACE_IN_ERR` - if set to 1, includes backtrace in polars-related error messages.
 
 > ℹ️ **NOTE:** To get a list of all active qsv-relevant environment variables, run `qsv --envlist`.
-Relevant env vars are defined as anything that starts with `QSV_`, `MIMALLOC_`, `JEMALLOC_`, `MALLOC_CONF` & the proxy variables listed above.
+Relevant env vars always include anything that starts with `QSV_`, `MALLOC_CONF` & the proxy variables listed above. Allocator-specific env vars are build-dependent: `MIMALLOC_` vars are included when qsv is built with mimalloc support, and `JEMALLOC_` vars are included when qsv is built with jemalloc support.
 
 ## MCP Server Environment Variables
 

src/main.rs

@@ -46,14 +46,14 @@ use crate::{
     config::SPONSOR_MESSAGE,
 };
 
-#[cfg(all(feature = "mimalloc", feature = "tikv-jemallocator"))]
+#[cfg(all(feature = "mimalloc", feature = "jemallocator"))]
 compile_error!("Features `mimalloc` and `jemallocator` are mutually exclusive. Enable only one.");
 
-#[cfg(feature = "mimalloc")]
+#[cfg(all(feature = "mimalloc", not(feature = "jemallocator")))]
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
 
-#[cfg(feature = "tikv-jemallocator")]
+#[cfg(all(feature = "jemallocator", not(feature = "mimalloc")))]
 #[global_allocator]
 static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 

src/maindp.rs

@@ -43,14 +43,14 @@ use crate::{
     config::SPONSOR_MESSAGE,
 };
 
-#[cfg(all(feature = "mimalloc", feature = "tikv-jemallocator"))]
+#[cfg(all(feature = "mimalloc", feature = "jemallocator"))]
 compile_error!("Features `mimalloc` and `jemallocator` are mutually exclusive. Enable only one.");
 
-#[cfg(feature = "mimalloc")]
+#[cfg(all(feature = "mimalloc", not(feature = "jemallocator")))]
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
 
-#[cfg(feature = "tikv-jemallocator")]
+#[cfg(all(feature = "jemallocator", not(feature = "mimalloc")))]
 #[global_allocator]
 static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 

src/mainlite.rs

@@ -10,14 +10,14 @@ use crate::{
     config::SPONSOR_MESSAGE,
 };
 
-#[cfg(all(feature = "mimalloc", feature = "tikv-jemallocator"))]
+#[cfg(all(feature = "mimalloc", feature = "jemallocator"))]
 compile_error!("Features `mimalloc` and `jemallocator` are mutually exclusive. Enable only one.");
 
-#[cfg(feature = "mimalloc")]
+#[cfg(all(feature = "mimalloc", not(feature = "jemallocator")))]
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
 
-#[cfg(feature = "tikv-jemallocator")]
+#[cfg(all(feature = "jemallocator", not(feature = "mimalloc")))]
 #[global_allocator]
 static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 

src/util.rs

@@ -596,9 +596,9 @@ pub fn version() -> String {
         let mimalloc_version = mimalloc::MiMalloc.version();
         format!("mimalloc {mimalloc_version}")
     };
-    #[cfg(feature = "tikv-jemallocator")]
+    #[cfg(all(feature = "jemallocator", not(feature = "mimalloc")))]
     let malloc_kind = "jemalloc";
-    #[cfg(not(any(feature = "mimalloc", feature = "tikv-jemallocator")))]
+    #[cfg(not(any(feature = "mimalloc", feature = "jemallocator")))]
     let malloc_kind = "standard";
     let (qsvtype, maj, min, pat, pre, rustversion) = (
         option_env!("CARGO_BIN_NAME"),
@@ -658,7 +658,7 @@ pub fn show_env_vars() {
             env_var_set = true;
             woutinfo!("{env_var}: {v:?}");
         }
-        #[cfg(feature = "tikv-jemallocator")]
+        #[cfg(all(feature = "jemallocator", not(feature = "mimalloc")))]
         if env_var.starts_with("QSV_")
             || env_var.starts_with("JEMALLOC_")
             || env_var == "MALLOC_CONF"
@@ -667,7 +667,7 @@ pub fn show_env_vars() {
             env_var_set = true;
             woutinfo!("{env_var}: {v:?}");
         }
-        #[cfg(not(any(feature = "mimalloc", feature = "tikv-jemallocator")))]
+        #[cfg(not(any(feature = "mimalloc", feature = "jemallocator")))]
         if env_var.starts_with("QSV_")
             || OTHER_ENV_VARS.contains(&env_var.to_ascii_lowercase().as_str())
         {