docs(workshops): planet-down cascade workshop + misc stray files

Planet-down cascade workshop (3 rounds, 5 agents): layer-by-layer
generation from empty world through population overlay, city planning,
and street rendering. Includes consultant review by Troblum.

Also commits: pre-Sprint-35 DB backup, Claude Code team-mode tmux
test log (team-test.md).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

team-test.md

@@ -0,0 +1,84 @@
+# Team Tmux Pane Test
+
+## Problem
+
+`teammateMode: "tmux"` is broken in Claude Code v2.1.117-119. Agents spawn as
+invisible background processes instead of getting their own tmux panes. This is
+a regression — tmux panes worked correctly on this machine through Sprint 35
+(see `~/.claude/teams/sprint-35-*/config.json` for proof: `backendType: "tmux"`
+with real pane IDs).
+
+## Relevant GitHub issues
+
+- https://github.com/anthropics/claude-code/issues/51818 — teammate CLI crash on permission_response
+- https://github.com/anthropics/claude-code/issues/52337 — subagent Ink rendering crash on Edit/Write
+
+## Config (already set, do not change)
+
+- `.claude/settings.json` has `"teammateMode": "tmux"` and `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1`
+- tmux is running, `$TMUX` is set, `TERM=tmux-256color`
+
+## Version gate
+
+**Always start by looking up the release notes** for any versions between the last
+tested version and the current one. Check the GitHub releases page at
+`https://github.com/anthropics/claude-code/releases` for fixes related to teams,
+tmux, teammates, or the tracked issues below. If the release notes show no relevant
+fixes, log the version as SKIPPED (no relevant fixes) and stop — do not run the
+test procedure.
+
+**Check `claude --version` first.** If the version appears in the "Tested versions"
+log below, the bug was already confirmed broken on that release — do not re-test.
+Only run the test procedure on a version not yet logged.
+
+### Tested versions
+
+| Version | Date | Result |
+|---------|------|--------|
+| 2.1.119 | 2026-04-25 | BROKEN — no tmux pane, no team config on disk |
+| 2.1.120–122 | 2026-04-30 | SKIPPED — release notes show no teams/tmux/teammate fixes; #51818 and #52337 still open (dupes of #51855, unreleased) |
+| 2.1.123 | 2026-04-30 | PARTIAL — tmux pane spawns, config on disk correct (backendType: tmux, paneId: %23). Custom subagent_type ("qatux") missing SendMessage — can receive but not send. General-purpose subagent_type has SendMessage — two-way comms work. BOTH types fail to process shutdown_request. TeamDelete reports success but does NOT kill the tmux pane — agent process keeps running, requires manual ctrl-c + exit. |
+| 2.1.123 (workshop) | 2026-04-30 | UPDATE — full workshop run with 4 general-purpose agents. Two-way comms confirmed for all. shutdown_request processed successfully by all 4 agents (contradicts earlier single-agent test). TeamDelete cleaned up correctly. Workaround: use general-purpose subagent_type with personality baked into prompt instead of custom subagent_type. |
+
+## Test procedure
+
+1. Check version: `claude --version`
+2. If the version is already in the "Tested versions" table above, **stop here** —
+   log nothing, do not spawn agents. Report that the version is unchanged.
+3. Create a team and spawn one agent:
+
+```
+TeamCreate: team_name = "tmux-test"
+Agent: name = "qatux", subagent_type = "qatux", model = "sonnet",
+       run_in_background = true,
+       prompt = "You are a test agent. Message the team lead: 'tmux pane test — I am alive.' Then stay idle."
+```
+
+4. Check: did a new tmux pane appear? Run `tmux list-panes -a` to verify.
+5. Check: does `~/.claude/teams/tmux-test/config.json` exist and contain `backendType: "tmux"`?
+6. Log the result in the "Tested versions" table above (version, date, BROKEN/FIXED + notes).
+7. If BROKEN, clean up any leftover team state and stop. If FIXED, proceed to "Cleanup".
+
+## Expected result (when fixed)
+
+- A new tmux pane opens with the Qatux session visible
+- Team config on disk shows `backendType: "tmux"` with a real pane ID
+- Agent is reachable via SendMessage
+
+## Actual result (v2.1.119)
+
+- No tmux pane appears
+- No team config directory created on disk
+- Agent runs as invisible background process
+
+## Context
+
+This blocks the generation-cascade workshop (ticket #897, Sprint 38). The full
+workshop has 3 participants (Gestalt, Tyre, Miri) + Qatux documenter, 3 rounds.
+Team and tasks are already created — once tmux panes work again, spawn the
+agents and go. See `docs/workshops/generation-cascade/BRIEF.md` for the full
+workshop brief.
+
+## Cleanup
+
+Delete this file and `TeamDelete` the tmux-test team once the test passes.