docs(report): quiet window closed — 30 healthy cycles, 0 heals; log_level reverted

REPORT.md

@@ -211,9 +211,11 @@ strongest evidence is therefore what did *not* happen, verified from inside the
 On 2026-07-20 every one of those was dead for 1h15m. This time the outage was **prevented**, not
 detected.
 
-**The negative legs, both clean.** Exactly ONE heal (`grep -c` = 1), zero re-heals, zero
-guestnet WARN/ERROR in the quiet window that followed, and the healthy Debug line kept appearing
-each cycle — so "no alarms" stayed distinguishable from "not probing".
+**The negative leg — 30 healthy minutes, run in full.** From the heal at 12:45:18 to 13:16:15:
+**30 healthy Debug cycles** (exactly one per minute — the cadence is precise), **0 heals**,
+**0 WARN**, **0 ERROR**. So the damper is not a mute and the quiet path is not silence: "no alarms"
+stayed continuously distinguishable from "not probing", which is the v0.91.2 lesson holding in
+production.
 
 **An unplanned damper proof, against a REAL transient.** STOP-1's guest reboot at 12:53 caught the
 guest mid-boot:
@@ -251,4 +253,7 @@ the AST wiring test, but seeing it in a real hub report needs the operator UI.
 2. **STOP-3** — Day-0 manifest Agent → **0.92.1** / `7424bc1c3c533eff9157e15a18d4635c624931f5a479a48126de77a94e6a3d4d`
    (wrapper sha unchanged — `configs/felhom-pbs-apply` was not touched). MinAgent is the operator's
    call; 0.92.1 is safe once felhom-pve has converged, which it has.
-3. Revert `log_level` to `info` after STOP-2.
+3. ~~Revert `log_level` to `info`~~ — **DONE** (13:17 CEST, after the quiet window closed; agent
+   restarted clean, caps `68/68 ok, degraded=0`, watchdog back up). The temporary raise is recorded
+   here only so the journald volume change is explainable; `/root/agent.json.bak-debuglevel` remains
+   as the pre-change copy.