Search stuck and never finishes

Describe the bug

I created a md to work around the issue, and it has the description

cat ~/.copilot/instructions/search-tool-workaround.instructions.md

Search / grep tool workaround

In this environment the built-in grep tool (and code-search tooling built on
it) can stall for minutes on the "Search" spinner, even though the underlying
ripgrep work completes in milliseconds. This is a tool-invocation-layer issue,
not a real search cost:

• Single-file ripgrep: ~2 ms
• Whole 70 GB / ~825k-file working tree: ~3.8 s

So the multi-minute "Search" hangs are NOT caused by ripgrep or repo size.

Guidance

• Prefer plain grep/rg and view/cat/sed via the bash tool for
  searching file contents and reading files. These return in milliseconds.
• Avoid the built-in grep tool here until the responsiveness bug is fixed.
• Always scope searches to a specific path/file when possible
  (e.g. grep -nE 'pattern' path/to/file).

Affected version

GitHub Copilot CLI 1.0.79

Steps to reproduce the behavior

everytime it needs to Search

Search "something" ....

which stuck forever

Expected behavior

No response

Additional context

No response

首先使用内置的 Search/grep 工具在 GitHub Copilot CLI 1.0.79 中复现挂起问题，然后将其与 ~/.copilot/instructions/search-tool-workaround.instructions.md 中描述的基于 bash 的 grep 或 rg 命令进行比较。跟踪 Search 的调用层，而不是 ripgrep 的性能。搜索能够完成，而不是一直停留在 Search spinner 上，即表示完成。