feat(frank-dragoon): halogen-flash-server 0.16.2 -> 0.18.20, NPU lane re-pinned

The engine pin moves to the newest vendor release (0.18.20, image built
2026-10-30). The payload lock is the gate this deploy has to pass: the v2
.hgn loads only in the flash-server line, so /health plus the boot ledger
decide, and the rollback is the 0c61bf84 digest on the same env line.

0.18.20's NPU catalog is NOT the 0.16.2 one: it names 14 device programs
(u0..u13) and an 8,495,512 B consts.hnpb where 0.16.2 had 10 and 5,086,496 B,
and the entrypoint verifies size+sha256 for every staged file before it
starts. HALOGEN_NPU_MODELS names qwen3-embedding-0.6b, so the staging set is
re-pinned to revision 8fd44c9f with the new block — bumping the engine alone
would refuse the boot on the NPU lane.

scripts/frank-dragoon.env

@@ -10,8 +10,11 @@
 # The .hgn format is the lock: it loads ONLY in the flash-server line, so the
 # engine moves with the payload, never ahead of it.
 # Image digest-pinned (a tag pull silently re-points; the digest is what was
-# qualified — 0.16.2 is the version the model card names as its quickstart pin).
-FRANK_DRAGOON_IMAGE=ghcr.io/peonist-ai/halogen-flash-server@sha256:0c61bf84ac22308a53f5d1ca6b86806702d7039e5ebc51cae4c66621b92fe04a
+# qualified). 0.18.20 since 2026-10-30 (was 0.16.2, the model card's quickstart
+# pin) — the vendor has moved two minor versions and the payload lock is what
+# the deploy's health gate plus the boot ledger decide; rollback is the
+# previous digest, 0c61bf84…, on this same line.
+FRANK_DRAGOON_IMAGE=ghcr.io/peonist-ai/halogen-flash-server@sha256:e35133b206da3094cc4d70c78800b26235bd9124b9aeb0e029d4a7c153b9cff0
 # Container identity kept from the 27B era: the unit's ExecStop names it.
 FRANK_DRAGOON_CONTAINER=frank-dragoon-halogen
 # Predecessor identity the serve script clears if it is still holding the GPUs.