fix: rm dynamic part from bash tool description again to restore cache hits across projects (#20771)

packages/opencode/src/tool/bash.txt

@@ -2,7 +2,7 @@ Executes a given bash command in a persistent shell session with optional timeou
 
 Be aware: OS: ${os}, Shell: ${shell}
 
-All commands run in ${directory} by default. Use the `workdir` parameter if you need to run a command in a different directory. AVOID using `cd <directory> && <command>` patterns - use `workdir` instead.
+All commands run in the current working directory by default. Use the `workdir` parameter if you need to run a command in a different directory. AVOID using `cd <directory> && <command>` patterns - use `workdir` instead.
 
 IMPORTANT: This tool is for terminal operations like git, npm, docker, etc. DO NOT use it for file operations (reading, writing, editing, searching, finding files) - use the specialized tools for this instead.