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feat: add OpenCode plugin host foundation #5072

Job	Run time
Shell Deploy Scripts	11s
DSH Profile Packaging (windows-latest)	49s
Rust Build Check (macos-15)	15m 15s
Rust Build Check (ubuntu-latest)	9m 47s
Rust Build Check (windows-latest)	19m 22s
CLI Tests (ubuntu-latest)	6m 7s
CLI Tests (macos-15)	8m 54s
Frontend Build	15s
	1h 0m 40s