docs: lead decision 69, Rocko moves to a Claude thread under R26 (sage)

Jason's R26 via Mos: Claude first, Codex only on gpt-6.1-sol, never
Astra. Rocko's Codex thread ran gpt-6-astra; the seat now runs as T3
thread b84bb264 on Opus 5.5, because its only row, S4, builds mosaic
decide and the gated decision DM. Roster updated. Filbert's launcher
still pins Astra; recorded as a follow-up, unused while Filbert runs in T3.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/SESSIONS.md

@@ -521,3 +521,4 @@ are never rewritten or removed; corrections are new entries.
 - 2026-10-05 | rocko | row44 S2c / #1526 | Within-role citations preserved without consumption; README evidence wording fixed; 58/58 Node24+26, three mutants; eight suites pass, task26/2 Docker-disabled; review opened rev151, expected token-free post failure rev152; no commit.
 2026-10-05T23:18:04Z | Dewey (T3 Claude Code, thread 84fb346c) | row 40 S5 #1522, S2c repin | check 16 repinned to d27042fa (broker 51e03b33), verify 15/0 failed/2 N/V, 203 rows equal; probe confirms LD65 on d27042fa (citation stored, not consumed); fixture adds message.send action.allowed for 101/102; SLICE1-VIEWS.md section 10 says S2c restores them; no commit.
 2026-10-08T21:53:57Z | Sage (T3 Claude Code, thread 1ef1e4f8) | Mos 1eba59e5, Jason R1/R5/R8/R10/R17 | merge plan docs/plans/2026-10-08_refactor-to-next-merge-plan.md (pinned b8db39cf/2101c9b4, merge-tree clean); lead decision 66 (next trunk, estate Vikunja Path A replaces LD61 Path B, R1 defaults); runbook Path A text; nothing merged
+2026-10-08T22:50:00Z | Sage (T3 Claude Code, thread 1ef1e4f8) | Mos R26, lead decision 69 | Launched Rocko as T3 thread b84bb264 (claude-opus-5-5) replacing Codex/Astra thread 9b95add7; old thread idle and not messaged; row 39 unchanged; roster updated; Filbert launcher Astra pin recorded as follow-up.

docs/plans/2026-09-26_lead-decisions.md

@@ -1251,3 +1251,33 @@ which stay with him. Each item names who decided it and what happened.
       2.7.0 OpenAPI), not a bare array. The probe's `items ?? body`
       read hid it. The runbook's listing line now reads `.items[]?`,
       which also covers a null `items`.
+69. **R26 on the stack: Rocko moves to a Claude thread (2026-10-08).**
+    Source: Mos, thread 1eba59e5, relaying Jason's R26. Agentic work
+    runs on Claude models first. Codex sessions use `gpt-6.1-sol` and
+    never Astra, and T3's Codex harness defaults to `gpt-6-astra`.
+    - Stack seats in T3 on 2026-10-08: Sage, Darkwing, Dewey and
+      Filbert run Claude Opus 5.5. Researcher (9bac0794) runs Claude
+      Sonnet 5.5. Rocko (9b95add7) ran Codex on `gpt-6-astra`.
+    - Mos's option (a), a Claude thread for Rocko, chosen over (b), a
+      Codex thread on Sol. Reviews already pair Claude with Claude, and
+      a second model family would buy reviewer diversity, but R26 puts
+      Claude first, and (b) needs a reason I don't have.
+    - The new Rocko thread is b84bb264, on Opus 5.5, not the roster's
+      Sonnet. Rocko's only open row is S4, which builds
+      `mosaic decide` (it refuses inside an agent run) and the gated
+      decision DM to Jason. Under Mos's split, authority and security
+      work runs on Opus. T3 can't change a thread's model, so the
+      thread starts on the model S4 needs. This stays inside decision
+      45's limit of four Opus sessions. The roster in `agents/README.md`
+      records it.
+    - Clean point: the old thread was idle, row 39 is queued and not
+      briefed, and the earlier packets stay under `agents/rocko/work/`.
+      Nobody messages the old thread again, because that spends Astra
+      usage. Its rules carry over: no Gitea credentials, no launch, no
+      commits.
+    - Follow-up: `agents/filbert/launch.sh` pins
+      `openai-codex/gpt-6-astra:low`, and `scripts/test-darkwing-launch.mjs`
+      asserts it. Filbert runs on Claude in T3, so nothing uses that
+      launcher today. Its Astra pin conflicts with R26, and the roster
+      says not to use it until a reviewed change moves it to Claude or
+      Sol.