Improve zjit's doc about testing

Author: st0012

doc/zjit.md

@@ -78,7 +78,31 @@ use `make`.
 
 </details>
 
-### test/ruby/test\_zjit.rb
+### make zjit-test-ruby
+
+This command runs only the ZJIT-specific Ruby tests (`test/ruby/test_zjit.rb`).
+
+```
+make zjit-test-ruby
+```
+
+### make zjit-test-ruby-all
+
+This command runs all Ruby tests with ZJIT enabled. Currently excludes some tests that are known to fail, but the goal is to support all tests.
+
+```
+make zjit-test-ruby-all
+```
+
+### make zjit-test-rust-lldb
+
+This command runs a specific Rust test under LLDB debugger. Useful for debugging failing tests.
+
+```
+make zjit-test-rust-lldb ZJIT_TESTS=test_putobject
+```
+
+### make zjit-test-ruby
 
 This command runs Ruby execution tests.
 
@@ -91,3 +115,31 @@ You can also run a single test case by matching the method name:
 ```
 make test-all TESTS="test/ruby/test_zjit.rb -n TestZJIT#test_putobject"
 ```
+
+## Other ZJIT Commands
+
+### make zjit-bindgen
+
+This command regenerates the Rust bindings for ZJIT. Run this after modifying C code that ZJIT needs to interact with.
+
+```
+make zjit-bindgen
+```
+
+Requires a `--enable-zjit=dev` build and Clang. The generated bindings are in `zjit/src/cruby_bindings.inc.rs`.
+
+### make zjit-bench
+
+This command runs ZJIT benchmarks using the zjit-bench repository.
+
+```
+make zjit-bench
+```
+
+### make update-zjit-bench
+
+This command updates the zjit-bench repository to the latest version.
+
+```
+make update-zjit-bench
+```