frank-dragoon: promote the A/B verification harness into the repo

The three artifacts that produced the native-vs-swift15 verdict, so the next
payload swap starts from instruments instead of ad-hoc scripts:

  census-frank-dragoon.sh — the engine's own checkpoint tools (verify/ppl/niah)
    over BOTH payloads under one knob set; the pool stays 524288 deliberately
    because the ppl pass scores 297,053 ids as two 262,144-token sequences.
  battery-frank-dragoon.py — behavior battery against the live service: refusal
    census, thinking-token census, tool-call turns, the red-PNG vision probe,
    needle-in-haystack, decode/prefill/prompt-cache rates; discards the
    post-boot warmup request and records the engine's 400 body (which names the
    exact token overage) instead of dying on it.
  trial-frank-dragoon.sh — the guarded candidate window: fetch gate, verify,
    stop+mask, census, boot through a transient FRANK_DRAGOON_ENV_FILE drop-in,
    battery, trap-guarded restore.

scripts/census-frank-dragoon.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+# census.sh — the engine's own checkpoint tools against both frank-dragoon
+# payloads, under ONE knob set, so every number is comparable.
+#
+#   verify  is the downloaded file what it says it is (no GPU, no model load)
+#   ppl     perplexity + KL/top-1 against a reference dump of the CURRENT
+#           checkpoint on the wikitext-2 raw test split — the answer to "is
+#           the stock peonist n-gram table good enough for this native
+#           conversion?" A table mismatched to the checkpoint corrupts the
+#           forward pass, and perplexity is the cheapest instrument that
+#           sees that (card reference points: r2 base 3.134, swift15 3.229).
+#   niah    retrieval by depth — the other thing a wrong lookup table breaks.
+#
+# ppl/niah LOAD THE MODEL: the service must be stopped (fleet benchmarking
+# law). Stage arg: verify | ref | cand | niah-cur | niah-new | all.
+#
+# The pool stays 524288 — the OUTGOING server's value at census time — on
+# purpose: the ppl pass scores 297,053 ids as TWO 262,144-token sequences,
+# which only fits a 524,288-position pool. Pool size buys capacity, never
+# numerics, so the dump and the comparison stay reproducible even though the
+# deployed knob has since dropped to 262144.
+set -euo pipefail
+
+IMG=ghcr.io/peonist-ai/halogen-flash-server@sha256:0c61bf84ac22308a53f5d1ca6b86806702d7039e5ebc51cae4c66621b92fe04a
+CUR=/home/dank/models/halogen-flashnext-v2
+NEW=/home/dank/models/halogen-v2-abliterated
+CUR_CK=qwen38-flash-next-v2-swift15-abliterated.hgn
+NEW_CK=qwen38-flash-next-v2-abliterated.hgn
+CORPUS=/eval/wikitext-2-raw-test.txt
+REF=/eval/swift15-wikitext2.ref
+
+run() {   # run <payload-dir> <checkpoint-file> <mode> [args...]
+    local dir="$1" ck="$2"; shift 2
+    podman run --rm --ipc=host --ulimit memlock=-1:-1 \
+        --device /dev/kfd --device /dev/dri --group-add keep-groups \
+        --security-opt seccomp=unconfined \
+        -e HALOGEN_MODEL_ID=frank-dragoon \
+        -e HALOGEN_CHECKPOINT="/models/$ck" \
+        -e HALOGEN_NGRAM_TABLE=/models/qwen38-flash-next-ngram.hgn \
+        -e HALOGEN_TOKENIZER=/tokenizer \
+        -e HALOGEN_CTX=262144 \
+        -e HALOGEN_KV_POOL_POSITIONS=524288 \
+        -e HALOGEN_KV_SLOTS=2 \
+        -e HALOGEN_HOST_RESERVE_GIB=20 \
+        -e HALOGEN_SPEC_ADAPT=0 \
+        -e HALOGEN_MAX_TOK=8192 \
+        -e HALOGEN_WEIGHTS_LOCK=1 \
+        -v "$dir:/models:ro" -v "$dir/tokenizer:/tokenizer:ro" \
+        -v /tmp/halogen-eval:/eval \
+        "$IMG" "$@"
+}
+
+stage="${1:-all}"
+case "$stage" in
+  verify)   run "$NEW" "$NEW_CK" verify "/models/$NEW_CK" ;;
+  ref)      run "$CUR" "$CUR_CK" ppl "/models/$CUR_CK" \
+                --corpus "$CORPUS" --ref-out "$REF" ;;
+  cand)     run "$NEW" "$NEW_CK" ppl "/models/$NEW_CK" \
+                --corpus "$CORPUS" --ref "$REF" --worst 5 ;;
+  niah-cur) run "$CUR" "$CUR_CK" niah "/models/$CUR_CK" \
+                --corpus "$CORPUS" --depths 4096,32768 --positions 0.05,0.5,0.95 ;;
+  niah-new) run "$NEW" "$NEW_CK" niah "/models/$NEW_CK" \
+                --corpus "$CORPUS" --depths 4096,32768 --positions 0.05,0.5,0.95 ;;
+  all)
+      for s in verify ref cand niah-cur niah-new; do
+          echo "===== $s $(date -Is)"
+          "$0" "$s" || echo "===== $s FAILED (exit $?)"
+      done ;;
+  *) echo "usage: $0 verify|ref|cand|niah-cur|niah-new|all" >&2; exit 2 ;;
+esac