Default-off, BETA, claude-only capability adopting Claude Code's Workflow tool (/effort ultracode, Agent SDK >= v0.3.149) as an optional parallel-execution backend for the GSD loop. Restores the wave parallelism + plan-checker + verifier that #853 forces inline on Claude Code, and folds gsd-ultraplan-phase under one runtime gate. - Pure fail-closed core (src/claude-orchestration.cts): detectWorkflowBackend (gate ladder: enabled -> Claude -> backend != inline -> nested+background host -> valid Agent SDK -> SDK >= floor; every miss degrades to inline) and emitWorkflowScript (waves -> parallel() barriers, plans -> gsd-executor + worktree, files_modified overlap -> separate stages, resumeFromRunId, budget). All interpolated identifiers validated script-safe; briefs JSON-quoted. - claude-orchestration command family (gsd-tools claude-orchestration detect-backend|emit-workflow) for orchestrator invocation. - Two gated loop contributions at wired points (execute:wave:post, plan:post); federated config keys (enabled/execution_backend/min_agent_sdk_version). - ADR-1143 implementation amendment; CONTEXT.md glossary entry; explanation doc. On any runtime lacking the Workflow tool, behaviour is byte-identical to today. closes #1143
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