docs(changelog): a runner you assign now runs the work

[indykish]

Changelog entry for M156 (agentsfleet PR #585).

A host could show Active and Online, take an isolation assignment, and still fail every job: the daemon never enabled the resource controllers systemd delegated to it, and the sandboxed child had no HOME to resolve its configuration from, so each lease died at startup with UZ-EXEC-012 and no cause in the journal.

Eight bullets across the two surfaces an operator touches — the failures themselves, and the dialog that assigns the policy.

No page revisions. No published page documents the systemd unit, the isolation tiers, or the chat failure copy, so the <Update> is the whole user-visible surface. Grepped for agentsfleet-runner.service, RuntimeDirectory, subtree_control, Delegate=, "needs instructions", "sandbox tier", and "Add Runner" across all 28 .mdx pages — only changelog.mdx matched.

Voice self-audit: one headline, no marketing words, **Bold lead-noun** — bullets, load-bearing facts kept verbatim (UZ-EXEC-012, HOME, cgroup.subtree_control, cpu memory pids, Delegate=, ProtectHome=yes, ProtectSystem=strict, RuntimeDirectory, agentsfleet-runner.service, system.slice), history append-only.

Land alongside #585 — the claims describe behaviour that ships in that PR.

🤖 Generated with Claude Code

Greptile Summary

Adds two Aug 1 changelog entries:

• Documents runner initialization, cgroup cleanup, readiness validation, failure messaging, and policy-dialog fixes.
• Documents account-specific free-trial boundaries, the nullable billing API field, and revised pricing copy.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
changelog.mdx	Adds release notes for runner reliability and policy-assignment fixes, plus account-specific free-trial behavior.

_{Reviews (2): Last reviewed commit: "docs(m156): changelog — the free trial e..." | Re-trigger Greptile}