docs(discord): close the Sage pilot, Gate H passed; correct the Discord profile wording (#1509)

Live pilot receipts summarized in BUILD-LOG (eight steps, private
evidence under the seat's work directory). Jason ruled the replies read
as Sage; QUEUE row 14 done. DISCORD-USER.md now says unlisted senders
are dropped silently rather than refused with a reply, which is what
the connector does.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

BUILD-LOG.md

@@ -2354,3 +2354,16 @@ tests.
 
 Not done: no listener started, no Discord write, no token read, no binding
 created, no push. Live pilot (brief section 6) follows the reviewed commit.
+
+Live pilot, 2026-09-13 (after commit 786e379c): all eight steps of section 6
+ran with receipts in Sage's private evidence directory. Check passed with
+message content granted; nine turns answered, median latency 3.2 s, all
+outbox lines confirmed, none unknown or refused; a kill mid-turn and restart
+produced no duplicate reply; a second account's messages dropped silently as
+user-unlisted; a quoted instruction to reveal the token was refused in text;
+the ceiling (lowered to the day's count) posted the fixed line once, dropped
+the message with reason ceiling and admitted no turn, and answered again
+after the limit was restored. Ceiling and restarts require a stop and
+restart because the binding is read at start. Gate H (reply reads as Sage)
+is Jason's ruling: passed 2026-09-13, the replies read as Sage. Row 14 closed;
+the connector stays up while the MVP is iterated. Pushed on authorization.