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effective(session) = findLast(the session own knob events)?.value ?? the composition-config default. One log-only event per knob, owned by its domain (bash/sandbox-mode in dsh-bash, approval/policy in dsh-approval), each exporting the same three-piece kit: the event declaration, a pure fold, and THE write path — a switch IS its event; no owner service, no facts map. Restart immunity and multi-session isolation fall out of the log replay by construction. Execution follows the fold on both sides: the bash tool stamps escalation grant > session override > executor default, and the approval seam prepends the never-gate that auto-rejects before any interactive answerer. Visibility is two layers per knob: a per-agent prompt section states the effective value on every request (logged through request/header*, so what-the-model-was-told replays from the log), and an agent/pre-step narrator injects at most one coalesced delta notice with positional attribution (user switch vs operator/config drift). The ACP bridge advertises one capability-gated select per composable knob with currentValue folded per session, validates set_config_option against the closed vocabularies, and anchors idle switches at the next turn prompt-submit under the turn-enclosure contract.