feat(extensions): activate external primary agent profiles #4280

Job	Run time
Rust Build Check (windows-latest)	1m 46s
CLI Tests (macos-15)	1m 58s
CLI Tests (ubuntu-latest)	1m 55s
Rust Build Check (macos-15)	1m 56s
Shell Deploy Scripts	9s
Rust Build Check (ubuntu-latest)	1m 54s
Frontend Build	1m 47s
	11m 25s

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