gate policy: frame-share is the verdict for owner-approved items; park after 2 failed rounds

Owner decision 2026-10-10. Eight items were livelocked in the nvenc tier, burning ~3.3
GPU-hours per pass (initial encode + quality+2 retry) and never converting: they missed the
mean bar by 0.2-1.7 thousandths (0.9626-0.9778) while keeping only 0.20-0.93% of frames
below 0.85 - and per this repo's own comment the FRAME-SHARE test is the one that actually
catches a defect, the mean bar splits a continuum. With SIZE_CEIL=1.0 the mean bar is
unreachable for them by construction.

- library_run.py: POLICY (C:\AI\transcode-run\gate_policy.json) with
  * accept - named items are judged by the frame-share test; a mean under the bar is logged,
    not enforced. An item that trips the frame-share test is refused even if listed
    (0912 洞见, 1.33%, is deliberately absent).
  * park  - failed quality ROUNDS per item; at PARK_AFTER=2 the item is skipped with a
    visible SKIP status instead of being re-encoded. Counters persist in the same file.
- scripts/build_gate_policy.py: builds that file from the run log, taking each key verbatim
  from the '--- i/n <relative path>' line (no hand-copying). Result: 7 accepted, 1 refused.
- run/relaunch_nvenc.sh: start the GPU tier ALONE (relaunch_tiers.sh hardcodes both tiers).
- STATE.md: the policy, its rationale and the round counter.

run/relaunch_nvenc.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# Start ONLY the nvenc (GPU) tier, DETACHED from Hermes.
+#
+# run/relaunch_tiers.sh hardcodes `for t in x265 nvenc`, so it cannot be used to start the GPU tier
+# alone; this is its nvenc-only twin. One lock per tier (C:\AI\transcode-run\run-nvenc.lock, and
+# transcode.Lock is staleness-aware so a lock left by a reboot needs no cleanup).
+#
+# 2026-10-10: the run is governed by C:\AI\transcode-run\gate_policy.json (owner decision):
+#   accept = items where the FRAME-SHARE test is the verdict and the mean bar only a warning
+#            (7 items that failed by 0.2-1.7 thousandths of mean while keeping 0.20-0.93% of frames
+#            below 0.85; 0912 洞见 at 1.33% is deliberately NOT on the list and keeps being refused)
+#   park   = failed quality ROUNDS per item; at PARK_AFTER=2 the item is skipped instead of
+#            re-encoded, which stops the ~3.3 GPU-hours/pass those items used to burn. Clear an
+#            item's entry there to retry it.
+#
+# Detached because a Hermes-scoped job dies with the session (measured 2026-10-08). No exit
+# notification: watch /d/tmp/xcode/run_nvenc.log. Stop by PID only, never by image name.
+
+set -u
+TOOLS=/c/Users/hoelee/AppData/Local/hermes/tools
+PY="$(ls -d $TOOLS/python-*/python.exe 2>/dev/null | head -1)"
+LIB='Z:\Class\#snapshot\GMT+08-2026.09.25-09.50.20\樊登读书\樊登读书会（每周更新）'
+NLOG=/d/tmp/xcode/run_nvenc.log
+
+exec >> "$NLOG" 2>&1
+cd /d/dev/universal-video-transcode || { echo "FATAL cannot cd to the repo"; exit 1; }
+echo "=== nvenc-only relauncher start $(date '+%F %T')  py=$PY"
+echo "=== origin root: $LIB"
+echo "=== gate policy: $(cat /c/AI/transcode-run/gate_policy.json 2>/dev/null | tr -d '\n' | cut -c1-160)"
+if [ ! -x "$PY" ]; then echo "FATAL python not found under $TOOLS"; exit 1; fi
+
+for i in 1 2 3 4 5 6 7 8; do
+  echo "=== relaunch attempt $i $(date '+%F %T')"
+  "$PY" -u scripts/library_run.py --tier nvenc --origin-root "$LIB" --reverse
+  rc=$?
+  echo "nvenc PASS-DONE rc=$rc attempt=$i $(date '+%F %T')"
+  [ $rc -eq 0 ] && break
+  sleep 60
+done