Add durable-agent-runtime research topic

durable-agent-runtime/next-steps.md

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+# Next Steps — Durable Agent Runtimes & Harness Engineering
+
+> Part of [[durable-agent-runtime/index|Durable Agent Runtimes & Harness Engineering]]
+
+## Open questions
+
+- [ ] Which repos get the `.agents/setup`-style contract first (clan-private, law retrieval, idx-cli)?
+- [ ] Should the dev-server + ports-file pattern be a shared script library in clan-private or per-repo?
+- [ ] Is hypeman worth an evaluation build on hermes-vm (per-task VM with standby) vs NixOS containers?
+- [ ] Revisit Cloudflare Code Mode for our Effect TS stack: tools-as-typed-API vs tool-calling.
+- [ ] Does the Forgejo webhook → kanban wake need a new service, or does an existing cron/webhook path cover it?
+
+## Decisions made (2026-08-07)
+
+- Research topic: **durable-agent-runtime** — covers durable objects, stateful machines, and harness engineering (sandboxed or not).
+- Do NOT build a distributed durable-object layer (celld) or actor platform (rivet) on a single box.
+- Do NOT build an E2B-style per-thread VM fleet; use NixOS-native isolation when needed.
+- DO build environment contracts: per-repo setup hooks, AGENTS.md per repo, dev-server skills, event wake.