Thread resumeSessionId through the ACP session spawn pipeline so agents
can resume existing sessions (e.g. a prior Codex conversation) instead
of starting fresh.
Flow: sessions_spawn tool → spawnAcpDirect → initializeSession →
ensureSession → acpx --resume-session flag → agent session/load
- Add resumeSessionId param to sessions-spawn-tool schema with
description so agents can discover and use it
- Thread through SpawnAcpParams → AcpInitializeSessionInput →
AcpRuntimeEnsureInput → acpx extension runtime
- Pass as --resume-session flag to acpx CLI
- Error hard (exit 4) on non-existent session, no silent fallback
- All new fields optional for backward compatibility
Depends on acpx >= 0.1.16 (openclaw/acpx#85, merged, pending release).
Tests: 26/26 pass (runtime + tool schema)
Verified e2e: Discord → sessions_spawn(resumeSessionId) → Codex
resumed session and recalled stored secret.
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