the fork blocker was a missing credential, not an upstream bug

Andre said his terminal opencode reaches paid zen models and suggested it was simply not set
up here. Correct, and my second wrong call on this page.

The new /api pipeline has its own credential store — /api/integration and /api/credential —
separate from auth.json, which is what the CLI, opencode run and the legacy /session surface
read. Ours had none connected, so it fell back to what needs no credential: the free tier.
One POST to /api/integration/opencode/connect/key fixes it, and it survives a serve restart.
sonnet and haiku both run on the new pipeline now.

The tell I had and did not use: the configured default is big-pickle, and a session with no
model ran on ling-3.0-tiny-free INSTEAD of the default. A pipeline ignoring its configured
default cannot use it — a credential symptom, sitting in /config/providers the whole time.

So steer, queue, interrupt and the resumable per-session SSE are all available with real
models. alpha needs the same one-time connect, and the sidecar should do it at boot rather
than depend on someone having run it by hand.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/opencode-parity.md

@@ -91,7 +91,7 @@ is gone. What remains is bucket 1 — capabilities Claude has and OpenCode does
 visible ones (token streaming, mid-turn injection, background tasks, interrupt-without-teardown) are
 downstream of `stdin: 'ignore'` and therefore of the Phase 2 fork.
 
-**The fork is REOPENED and worth taking.** The serve publishes a newer `/api/session/*` surface offering
+**The fork is REOPENED, unblocked, and worth taking.** The serve publishes a newer `/api/session/*` surface offering
 those capabilities natively, and on 1.18.16 **`delivery: "steer"` and `delivery: "queue"` are both
 verified working** — mid-turn injection and queueing, as primitives, plus `/interrupt` and a resumable
 per-session event stream. One blocker remains: `claude-sonnet-4-6` silently does not run on that surface