Calibrate planning task creation against the current composer

Retain the zero-model UI setup failure and create tasks through the real composer response. Remove random chat-fixture prefix collisions.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

doc/plans/2026-10-05-plan-task-guidance.md

@@ -65,3 +65,30 @@ of a bare issue-ID URL without the issues route. Product E2E typecheck passes.
 Initial local DB checks were skipped until the dependency's missing library
 symlinks were restored with its supplied postinstall script; skipped checks were
 not counted as passes.
+
+The next setup campaign, [37401094799](https://github.com/paperclipai/paperclip/actions/runs/37401094799),
+measured source `370e51d110836b942e5f90567d2bbe260bcc0f3a` using trusted workflow
+revision `0e0b63e5a551388ac4601ed982b3e8f1c772f123` (workflow blob
+`0600886144d3e22ea2e4a38329a79177882f3948`). It remains an original FAIL,
+classified by the harness as `candidate_failure`. Inspection shows a browser
+fixture error before task creation: the shared helper waited for the old Task
+title field. `runIds`, the company run ledger, and planning observation are all
+empty; no model executed. Cleanup passed. The billing summary's runCount=1 is
+its minimum-one placeholder (`billing.ts`), not evidence of a provider run;
+runtime/actual charges remain unmetered. No original result is regraded.
+
+The corrected planning-only browser helper uses the current description composer,
+explicitly selects the owner, and captures the public task-create response ID. A
+real browser/server/database calibration creates the exact prompt/assignment with
+paused non-provider agents, confirms zero run rows, and deletes its company. It
+passes. Before any model execution, prompts also explicitly name the already
+required result document key and exact JSON fields, avoiding an unstated oracle
+format assumption. The legacy helper and production UI remain unchanged.
+
+Repository checks at the previous source: full typecheck and build pass. Local
+full tests: 9,591 pass, 5,796 skip and one unchanged macOS real-Git streaming test
+hits its five-minute deadline; an isolated check also fails. Preserve this
+limitation. Normal CI found a different, exact cause: truncated random fixture
+company prefixes collided in chat integration setup. A monotonic per-suite
+prefix removes that collision; all five affected native-modal variants pass
+locally (1,058 unrelated cases filtered). This is a test-only repair.