#20864: fix(auto-reply): replace any with unknown in extractTextFromToolResult

## Summary Replace `any` parameter type with `unknown` in the private `extractTextFromToolResult` function. ## Changes - Remove `// oxlint-disable-next-line typescript/no-explicit-any` comment - Change `result: any` to `result: unknown` ## Motivation The function body already performs proper type narrowing via `typeof` checks and explicit casts, making the `any` annotation unnecessary. <!-- greptile_comment --> <h3>Greptile Summary</h3> Replaced `any` with `unknown` in the `extractTextFromToolResult` function parameter type, removing the associated oxlint disable comment. The function already performs proper type narrowing via `typeof` checks (line 57, 61) and explicit casts (line 60), making this change safe. The downstream `collectTextContentBlocks` function already accepts `unknown`, ensuring type compatibility. This aligns with the repository's coding style guideline to prefer strict typing and avoid `any`. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk - The change improves type safety by replacing `any` with `unknown` in a single function parameter. The function implementation already contains proper type guards and narrowing, and all downstream dependencies accept `unknown`. This is a straightforward refactoring with no behavioral changes. - No files require special attention _{Last reviewed commit: 5d0e1f7} <!-- greptile_other_comments_section --> _{(5/5) You can turn off certain types of comments like style [here](https://app.greptile.com/review/github)!} <!-- /greptile_comment -->