docs(nh3-dev): add Booth + jackdaw-compose to the running-services inventory

Two user-systemd services stood up on nh3-dev this session weren't in the
"What runs here" list:
- The Booth (:8090, booth.service) — eshpfi services/booth ephemeral media board.
- jackdaw-compose (:8787, jackdaw-compose.service) — JackDAW /compose AI backend
  hosted for jackdaw-dev, Origin-gated, fronted by the :4500 bench proxy.
Keyless entries (the jackdaw unit's key stays server-side, uncommitted).

servers/nh3-dev/README.md

@@ -22,6 +22,15 @@ local Bash already executes here — no SSH-to-self needed for non-privileged wo
   `vh/mead-hall`.
 - **bloom_music dev** — `~/development/bloom_music`; its `web/` test harness uses
   Playwright headless Chromium for OSMD browser-geometry assertions.
+- **The Booth** — ephemeral media drop board (`:8090`, `booth.service`), from
+  eshpfi `services/booth/`. Lets CC sessions surface A/B renders + smoke results
+  (and browser uploads for pickup) to the operator; 24h TTL, Homepage-linked.
+- **jackdaw-compose** — JackDAW AI Composer `/compose` backend (`:8787`,
+  `jackdaw-compose.service`), a thin stateless `bun server/index.ts` from
+  `~/development/jackdaw` → LiteLLM `gen`. Origin-gated (INV-BK04/BK05), reached
+  same-origin via the `:4500` bench's `/compose` proxy. Hosted for jackdaw-dev
+  (their code; the model endpoint + key live in server env only — unit is `0600`,
+  not committed).
 
 ## Box-wide Playwright / Chromium (2026-06-04)