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- registry/components/auth_service_account: TinyGo impl for Google Service Account (JWT-bearer → token exchange) and base structure for AWS SigV4. - .component-builds/auth_service_account: independent Worker at auth-service-account.arcrun.dev, extends wasi-shim with an http_request host function for the token exchange step. - Delete cypher-executor/src/lib/wasm-executor.ts (legacy, replaced by component-loader WASM HTTP runner path). - credential-injector.ts service_account branch now throws — all service_account recipes must route through auth-dispatcher. Per .agents/specs/arcrun/credential-primitives-wasm Phase 2. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>