feat(discord): eyes reaction as a read receipt on every admitted message (#1509)

QUEUE row 15, MVP iteration 1 after the Sage pilot. rest.react is best
effort (2xx true, anything else false, never throws); the connector reacts
at admission before the engine runs and records the outcome in the turn
record as receipt. Drops and refusals get no reaction. Suite 28/28, 90
node tests.

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

docs/plans/QUEUE.md

@@ -40,6 +40,7 @@ Gaps found while working go to `docs/plans/DEFERRED.md`, not here.
 | 12 | Reviews as issue comments posted by `queue move ID in-review`, not files in `docs/plans/reviews/` | darkwing | #1508 | required; after row 9 | one review round with no new file under reviews/ | `2026-09-13_queue-as-data.md`, Piece D |
 | 13 | Ledger "queue" section: issue/row/seat drift printed with the weekly number | darkwing; filbert reviews | #1508 | required; after row 9 | first run Monday 2026-09-21, zero violations or every one moved same day | `2026-09-13_queue-as-data.md`, Piece E |
 | 14 | Discord connector pilot: Sage answers in Shared Signals (chat only, no tools, no repo writes) | coordinator; Filbert or orch-01 seat reviews | #1509 | done: rev-code-02 APPROVE 26170 (round 9), committed 786e379c; pilot steps 1-8 done with private receipts, Gate H passed (Jason, 2026-09-13: replies read as Sage); connector left running for MVP iteration | H: offline suite green, eight-step live pilot with private receipts, then Jason says the reply reads as Sage | `2026-09-13_discord-connector-pilot.md` |
+| 15 | Discord connector: eyes reaction on every admitted message as a read receipt (MVP iteration 1) | coordinator | #1509 | done: `rest.react` best effort, reaction placed at admission before the engine runs, outcome in the turn record, no reaction on drops or refusals; `scripts/test-discord.sh` 28/28 (90 node tests) | Jason sees the reaction on a live message | `2026-09-13_discord-connector-pilot.md` section 11 |
 
 Start message for row 6, sent from the board to darkwing:
 "Read docs/plans/QUEUE.md, then the plan page section "Piece 5: darkwing on
@@ -75,3 +76,4 @@ Gate F or when blocked."
 - 2026-09-13 — coordinator: row 14 stays in review; rev-code-02 round eight finding (26168, noncanonical start digits must refuse) fixed, round nine requested. No other row changed.
 - 2026-09-13 — coordinator: row 14 moved to in pilot; approved 26170, committed 786e379c (no push), check passed, connector running. No other row changed.
 - 2026-09-13 — coordinator: row 14 done; Gate H passed, Jason ruled the replies read as Sage. Connector stays up; MVP improvements come as new rows. No other row changed.
+- 2026-09-13 — coordinator: row 15 added and done (Discord read receipt, Jason's request after the pilot); committed after suites green. No other row changed.