chore(tasks): mark js01, con18-wss, fwd17-19, con18b completed

tasks/adapters/review-002-fwd17-19-contract-decisions.md

@@ -1,7 +1,7 @@
 ---
 id: review-002-fwd17-19-contract-decisions
 name: Forwarding contract decisions — non-JSON SSE payloads, double-routed placeholders, percent preservation (FWD-17/18/19 decide+document or fix)
-status: pending
+status: completed
 depends_on: [review-002-fwd15-stream-timeout]
 scope: narrow
 risk: low
@@ -65,4 +65,8 @@ Deliberately a decide-first task: none of the three is a crash or
 leak; each is a contract the code half-implies. Keep the decisions
 small and documented rather than building speculative machinery (e.g.
 no new envelope schema unless (b) is actually chosen). Coordinate with
-review-002-fwd13-dot-segments (same helpers, different concerns).
+review-002-fwd13-dot-segments (same helpers, different concerns).
+
+## Summary
+
+FWD-17: non-JSON SSE payloads surface as {data, event} wrapper (event: captured, WHATWG last-wins, leak fixed). FWD-18: structural placeholder values are INVALID_INPUT (no JSON splicing into paths). FWD-19: % in values always encoded, template text preserves pre-encoded % (ADR-066 trust boundary). ADR-066 records all three; SseEvent gained an event field (crate-internal).