chore(pstack): remove orchestrate playbook (0.15.3)

[poteto]

Why

Program-scale work had two routes in poteto-mode. Orchestrate ran a standing coordinator chat with its own store and CLI. Multi-phase plan wrote a checklist and named Autopilot-full or Autopilot-stack to run it. This PR deletes the Orchestrate playbook and keeps the second route. figure-it-out still takes any task that no bundled playbook fits.

The PR also folds in the unslop fix from #379, so both changes ship as 0.15.3. This PR supersedes #379.

Scope

• Delete pstack/skills/poteto-mode/playbooks/orchestrate.md.
• pstack/skills/poteto-mode/SKILL.md. Remove the Orchestrate bullet. The routing paragraph sends a standing program to Multi-phase plan, and the plan names Autopilot-full or Autopilot-stack.
• pstack/skills/poteto-mode/playbooks/multi-phase-plan.md and autopilot-full.md. Remove the Orchestrate sentences. A standing program follows the autopilot rule at the end of autopilot-stack.md.
• pstack/README.md and pstack/docs/guide/02-poteto-mode.md. Remove the orchestrate row and list item. The three playbook counts change from twenty-three to twenty-two. The principle counts do not change.
• pstack/docs/guide/07-overnight.md. A Multi-phase plan paragraph and example replace the Orchestrate paragraph. The overnight contract does not change.
• pstack/skills/unslop/SKILL.md. Remove disable-model-invocation: true, from fix(pstack): allow model invocation for unslop (0.15.3) #379.
• pstack/.cursor-plugin/plugin.json. Version 0.15.2 to 0.15.3.
• Out of scope. pstack/skills/poteto-mode/scripts/orch/ stays, although no playbook calls it now. The top-level orchestrate/ plugin and all other plugins do not change.

Blast Radius

Agents in poteto-mode lose the Orchestrate route. A standing program now stops at a written plan until the operator says go, and then an autopilot runs it. The agent can also select unslop on its own, and /unslop works as before.

Verification

• rg -n 'playbooks/orchestrate|orchestrate\.md' pstack prints nothing. rg -n -i orchestrat pstack matches only the scripts/orch/ CLI and unrelated uses of "orchestration", "orchestrates", and "orchestrator".
• ls pstack/skills/poteto-mode/playbooks | wc -l prints 22. The README table and the SKILL.md playbook list also have 22 entries each, and every link and path in them resolves to a file.
• rg -n -i 'twenty-(two|three) playbooks' pstack finds three lines, and each one says twenty-two.
• node scripts/validate-plugins.mjs prints "All plugins validated successfully." with ajv and ajv-formats installed as the CI workflow installs them.
• The relative links in 07-overnight.md and 02-poteto-mode.md resolve. A grep over the added diff lines finds no long dashes, semicolons, curly quotes, or mid-sentence colons.
• git diff --stat main...HEAD lists nine files, all under pstack/.

  

[poteto]

Closing per operator — not shipping the orchestrate playbook removal.