[Suggestion]: support scan_inclusions

Which fff frontend(s)?

Core or Rust crate

What problem are you trying to solve?

An option to provide scan_inclusions, namely to enable explicit inclusions of otherwise ignored paths.

This would I think be a better solve than #108/#530 (request for no-gitignore) This basically would close #80 This is similar to #448 but it scopes the list up instead of down

The argument for scan_inclusions is that increasingly repos need to control what their agents can find, and also what can be fuzzy-found from file search UIs. It would be generally useful, and as a few examples of common cases of gitignored files that many repos would like to make easily findable: .env.local, log files, skills localed in home dir.

prior art here is zed, which supports exactly this through file_scan_inclusions setting.

I have a PR (claude) but I didnt want to open it without discussion since IANA rust dev

Proposed solution

scan_inclusions as a list of glob patterns relative to the indexed root

https://github.com/rt2zz/fff/commit/f33677a0946d0efa831e0a978968e092974f7cba