fix: service queued process-control RPCs beneath WASM parents

[WellDunDun]

• Fix nested commands stalling when a WASM parent launches a shell that launches another process. Service queued process-control requests while preserving the parent's ownership of polling, output, and exit events.
• Share control-RPC classification across requeueing, dispatch, and the event pump to prevent their method lists drifting apart.
• Validation: the Rust workspace check, fixed-version check, and all three focused WASM-parent regressions pass. The added regression fails before the fix. On the 0.2.20 source pin, live shell probes and a real Codex subscription session successfully read a synthetic project brief with the unchanged adapter.
• No authentication, filesystem permission, or persistence changes. A separate WASM-to-Node stdout-loss case remains outside this fix.

[the-company-company]

🟠 1 medium-severity finding

_{Reviewed commit 280bd16.}

[the-company-company]

✅ No issues found

_{Reviewed commit 52ecf88.}