fix(coding-agent): scope nested .gitignore rules to their subtree in find

The find tool previously collected every .gitignore under the search
path and passed them to fd via --ignore-file. fd treats --ignore-file
entries as a single global ignore source, so rules from a/.gitignore
also filtered files under sibling b/.

Drop the manual collection and pass --no-require-git instead, which
makes fd apply hierarchical .gitignore semantics whether or not a git
repo is present.

closes #3303

packages/coding-agent/CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Fixed `--verbose` startup output to begin with expanded startup help and loaded resource listings after the compact startup header change ([#3147](https://github.com/badlogic/pi-mono/issues/3147))
 - Fixed `find` tool returning no results for path-based glob patterns such as `src/**/*.spec.ts` or `some/parent/child/**` by switching fd into full-path mode and normalizing the pattern when it contains a `/` ([#3302](https://github.com/badlogic/pi-mono/issues/3302))
+- Fixed `find` tool applying nested `.gitignore` rules across sibling directories (e.g. rules from `a/.gitignore` hiding matching files under `b/`) by dropping the manual `--ignore-file` collection and delegating to fd's hierarchical `.gitignore` handling via `--no-require-git` ([#3303](https://github.com/badlogic/pi-mono/issues/3303))
 
 ## [0.67.5] - 2026-04-16