Bill a turn to the node that asked, not the node that generated

Every turn runs on the AI owner now, so the ledger's per-host column had
collapsed to a single name and the fleet breakdown said nothing. The asking
node travels with the request and is validated before it is written, which
also retires ai_token_sync.sh — a partner ledger is empty by construction.

Deployment/master.conf.template

@@ -471,7 +471,6 @@
         # to 1 day). 30min was true "always fresh" but had no consumer that needed it that often.
         "Arrs_Stack/arr_cache_prefill.sh ARR_PREFILL_WAIT_MINUTES=1"  # keep the shared arr tracked-data cache fresh
         "Arrs_Stack/arrs_failed_stalled_recovery.sh"  # blocklist + re-search failed/stalled arr queue items
-        "AI/ai_token_sync.sh"                         # pull partner AI token ledgers into the tmpfs cache
     )
     # arr_sync.sh runs as a fixed first step in intermediate_sync_maintenance.sh — not listed here.
     # It is controlled by ARR_SYNC_ENABLED (see Arr Sync section above).
@@ -1966,12 +1965,13 @@
     AI_TOKEN_DB="${AI_DATA_DIR}/ai_token_history.db"
     AI_TOKEN_RETAIN_ROWS=20000      # oldest rows dropped past this — years of ordinary use
 
-# AI/ai_token_sync.sh pulls each partner's ledger into the tmpfs cache the tab reads, so the
-# fleet total is a fleet total. Same trick conf_sync.sh uses for partner confs, minus the push:
-# nothing here is needed by anyone else, so the reader fetches its own data and controls its
-# own freshness. An unreachable partner is a quiet skip, not a warning — a partner is expected
-# to be down for long stretches, and a four-hourly warn trains you to ignore the script.
-    AI_TOKEN_SYNC_ENABLED=true
+# AI/ai_token_sync.sh pulled each partner's ledger into a tmpfs cache so the fleet total was a
+# fleet total. The mesh shares one AI now: every turn generates on the owner and is recorded
+# there against the node that asked, so the owner's own ledger already holds the whole fleet and
+# a partner ledger is empty by construction. Left off the schedule rather than deleted — the
+# reader still merges any cache from before the change, which describes real turns.
+    AI_TOKEN_SYNC_ENABLED=false
+
 
 # ━━━ AI Feature Toggles ━━━
 # Tier 1 is narration — it cannot change a decision. Tier 2 adds context to a decision a script