Harden Data Machine compose lease recovery - #593
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Follow-up to #592 and #591.
Summary
Hardens the cross-process compose lease against stale-owner races without removing or renaming an expired owner. Recovery uses a separate operation-scoped lease, receipts are bound to the operation joined, and unreadable lease state uses bounded fallback. Explicit site identity coalesces sessions launched from different worktrees.
Verification
The focused test launches independent processes from two worktree directories against one explicit site. It also covers stale-owner recovery races, replacement receipts, mixed timeouts, and malformed lease state.
AI Assistance
GPT-5.6 Terra through OpenCode implemented and tested the repair; GPT-6 Astra through OpenCode triaged and dispatched it under Chris Huber's direction.