[Bug]:glob_files tool description advertises **/*.java pattern but BaseSandboxFilesystem implementation doesn't support it

The glob_files tool in FilesystemTool.java declares its pattern parameter with the example **/*.java:

@ToolParam(name = "pattern", description = "Glob pattern (e.g., **/*.java)")

However, BaseSandboxFilesystem.glob() translates this directly into find -name:

String cmd = "find " + escapedPath + " -type f -name " + escapedPattern + " 2>/dev/null | sort";

find -name does not support ** — it only matches the filename portion, so **/*.md always returns empty results.

Impact

- LLM follows the tool description, uses **/*.md as instructed
- Tool silently returns empty, model retries with list_files、raw find shell commands
- Causes 3-4 rounds of wasted tool calls and unnecessary context bloat

Steps to Reproduce

1. Create a sandbox-backed agent with files in subdirectories (e.g., knowledge/foo.md)
2. Call glob_files with pattern **/*.md
3. Observe empty results

Suggested Fix

Option A: Strip **/ prefix before passing to find -name:
String findPattern = pattern.startsWith("**/") ? pattern.substring(3) : pattern;

Option B: Update tool description to only advertise find -name compatible patterns (e.g., *.java).

Location

- FilesystemTool.java line 125