feat(core): Prefer rg in system path.

[joshualitt]

TLDR

Prefer rg in system path over downloading.

Testing Matrix

	🍏	🪟	🐧
npm run	❓	❓	:heavy_check_mark:
npx	❓	❓	❓
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

Linked issues / bugs

Fixes: https://github.com/google-gemini/gemini-cli/issues/11438

[github-actions[bot]]

Size Change: +465 B (0%)

Total Size: 20.3 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	20.3 MB	+465 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[cornmander]

We need to be careful with this, because the version installed on the system may be old and incompatible or buggy, or it may be a completely different binary altogether. I have a PR that introduces a checksum validation against a known-good version, maybe you can take a look at that?

[cornmander]

https://github.com/google-gemini/gemini-cli/pull/11548