feat(deferred): add fuzzy search matching for tool discovery

[Piyush0049]

Summary

This PR addresses the TODO: fuzzy search in the deferred toolset by replacing the rigid substring search with a lightweight fuzzy matching algorithm.

When an agent uses search_tool to discover deferred tools, it can now successfully match acronyms or partial words (e.g. searching for "crfil" will correctly match the "create_file" tool).

Changes Made

• Fuzzy Match Algorithm: Added a dependency-free fuzzyMatch helper function to pkg/tools/builtin/deferred/deferred.go that verifies if all characters in the query string appear in the target string in relative order.
• Search Update: Updated handleSearchTool to use fuzzyMatch against both the tool name and tool description, and removed the inline TODO comment.
• Test Coverage: Added explicit fuzzy search by name and fuzzy search by description test cases in deferred_test.go to ensure correctness.

Validation

• The full go test ./pkg/tools/builtin/deferred/... suite passes successfully.
• The files have been formatted cleanly using gofumpt to comply with repository standards.

[rumpl]

We are using fzf in this project for other things, let's use fzf also for this search, WDYT?

[Piyush0049]

We are using fzf in this project for other things, let's use fzf also for this search, WDYT?

Hmm, I think that would be better. I just removed the custom matcher and swapped it over to use fzf. It's actually way better this way since we can use the match score to rank the results.
I have pushed the changes. Please do let me know your POV and any other changes required.

[rumpl]

<3

[rumpl]

Amazing, thanks!