Fix cross-session resume lease cleanup deleting the owner entry

[RhysSullivan]

Problem

Cross-session resume still failed in production after #1312. Root cause: when the resume arrives on a session that does not own the execution, the local engine miss triggers the resume lifecycle's settle hook, and releasePendingApprovalLease treated "no local lease" as permission to delete the owner-directory entry. Session B deleted session A's entry, then the directory fallback read null and returned execution_not_found.

Found via a new worker-level e2e that runs the real worker with real Durable Objects and two real MCP sessions (pause on A, resume on B). Red before the fix with exactly the production symptom; green after.

Fix

• releasePendingApprovalLease no longer deletes the directory entry when there is no local lease; deletion happens only when the owning session releases its lease.
• Directory put/get/delete failures and forward failures/timeouts now emit structured console.error events (mcp_execution_owner_directory_error, mcp_model_resume_forward_error) and span annotations, so this class of silent degradation is diagnosable in production telemetry.
• The two-session worker e2e stays in the suite as the regression gate.

Tests

typecheck 42/42, lint clean, hosts/mcp 64, hosts/cloudflare 29, new e2e green.

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commit: 94e12c9