[SultanGun]

Summary

This PR adds a platform-specific file-writing helper that retries transient Windows file-sharing violations when FilePatchTool and FileWriteTool write files.

Problem

On Windows, file-writing operations can intermittently fail with ERROR_SHARING_VIOLATION (Win32 error 32) during repeated read-and-write sequences. This can cause otherwise valid file operations and tests to fail intermittently.

Changes

• Add a Windows-specific writeToolFile implementation with bounded retries for ERROR_SHARING_VIOLATION.
• Use exponential backoff with up to five total attempts and delays of 2, 4, 8, and 16 milliseconds.
• Return unrelated errors immediately without retrying.
• Preserve the existing in-place write behavior.
• Add a non-Windows implementation that delegates directly to os.WriteFile.
• Add unit and integration tests covering retry behavior, error handling, and modification callback semantics.

Verification

Verified locally on Windows with Go 1.27.3:

• gofmt -l .
• go vet ./...
• go test ./... -count=1
• go test ./internal/tools -run "^TestWriteToolFile_" -v
• Linux cross-compilation checks for the non-Windows implementation.

All listed checks passed in the reported local environment. Native macOS testing was not performed.

Scope

This PR focuses exclusively on the Windows file-writing fix and its tests. Fork-specific CI changes are intentionally excluded.