memory: nh3-dev /tmp auto-clean rule (tmpfiles 3d) + one-shot purge

persistent-memory.md

@@ -126,6 +126,8 @@ _As of 2026-07-18 — end of a long session. **Four major items ALL LANDED** (de
 
 ## Recent decisions
 
+- `[2026-07-18]` **nh3-dev /tmp auto-clean enabled** — Debian ships /tmp with no tmpfiles age (`D /tmp 1777 root root -` → never cleans); this high-churn agent box had accreted **~190k stale temp dirs / 25G**. One-shot manual purge (194k→10k entries, 25G→1.7G; deleted top-level dirs/files >1d old, spared `/tmp/claude-*` by name + anything ≤1d). Then `/etc/tmpfiles.d/tmp.conf` = `D /tmp 1777 root root 3d` (daily `systemd-tmpfiles-clean.timer` removes >3d-untouched items; active files + socket dirs spared). Tunable via the age. Note the churn: ~10k /tmp entries/day here.
+
 - `[2026-07-18]` **soong-lab containerize cutover COMPLETE + LIVE** — systemd→container on corviduo-dev :8443 (image `vh/soong-lab:latest` v0.3.24), data migrated (Sindra + portraits) + backed up, old service+webhook retired, Homepage tile added, operator functional-confirmed. Deploy `/home/infra-ops/soong-lab-deploy/`; no proxy (co-located WT, plain-http callback). → `persistent-memory.d/2026-07-18-soong-lab-containerize-cutover.md`
 
 - `[2026-07-18]` **zonos-gateway 0.2.1 — voice-resolved emotion presets baked (provisional)** — `resolve_preset(name,voice)` → per-voice axes cell (angry/happy/startled_happy + aliases); NOT a global preset (BrF named-angry→fear). Docs on /docs + /v1/dials + repo spec. Pushed main `8f1885b`/tag v0.2.1 (after reconciling two-unrelated-git-histories). → `persistent-memory.d/2026-07-18-zonos-gateway-0.2.1-emotion-presets.md`