Vendor the cohort's agent skills: gregoryfoster/skills, obra/superpowers, a brainstorming override, the auto-refresh hook #3

Problem

Processor has none of the cohort's agent tooling. Every sibling vendors gregoryfoster/skills under skills-vendor/, and all but broker also vendor obra/superpowers. So reviews and ships here run without the cohort's shared checks, and nothing refreshes them.

Scope

This follows managing-skills, with broker#15 as the precedent for a sibling that bootstrapped after the fact.

• Submodules skills-vendor/gregoryfoster-skills and skills-vendor/obra-superpowers
• The selection below, symlinked into skills/ (agentskills.io) and .claude/skills/ (Claude Code)
• skills/brainstorming override
• .skills/doctor.sh
• The auto-refresh SessionStart hook, both halves (symlink + .claude/settings.json entry)
• Ruff skips skills-vendor/; .gitignore covers the worktree roots and .claude/settings.local.json
• docs/SKILLS.md, an AGENTS.md pointer, and the PR workflow recorded as the repo standard
• A test that pins the symlink layout and both halves of the hook

Selection

gregoryfoster-skills (11): the set archiver and replicator link, less init-project-fastapi. That is curating-context, enforcing-architecture, init-socraticode, managing-skills, orchestrating-issue-backlog, reviewing-architecture, reviewing-code-python-fastapi, shipping-work-python-fastapi, using-git-worktrees, using-mayfly-chat and writing-plans.

obra-superpowers (11 + 1 override): dispatching-parallel-agents, executing-plans, finishing-a-development-branch, receiving-code-review, requesting-code-review, subagent-driven-development, systematic-debugging, test-driven-development, using-superpowers, verification-before-completion and writing-skills, plus brainstorming as a local override.

Decisions

• Review and ship use the -python-fastapi variants, though processor isn't a FastAPI service. Broker#15 did the same. The vendored pre-ship.sh runs exactly processor's gate (ruff check, ruff format --check, pytest minus integration) unmodified, so there is no pre-ship fork. The Click variant is another stack, and the stack-neutral one's pre-ship.sh is a stub.
• The brainstorming override is a minimal redirect (observo's pattern). It is upstream v6.4.2 verbatim, except that docs/superpowers/specs/ becomes docs/specs/, where the spec already lives. visual-companion.md and scripts/ stay vendor symlinks. The heavier forks (archiver, replicator, watcher, notifier) have each needed re-sync issues.
• Superpowers' using-git-worktrees and writing-plans are not linked. Their names collide with gregoryfoster's, which the cohort links. diagnosing-superpowers (new in v6.4.1) is linked by no sibling.
• Left out: init-project-fastapi (a scaffolder), vendoring-openapi-client (processor calls no sibling HTTP API), auditing-ci-cost (no CI), and the other stack variants.
• Changes land as issue, then branch, then PR. That is the standard for this repo from here on.

Not this issue

• curating-context's weekly cadence and PostToolUse write guard; SocratiCode indexing; processor's row on upstream's .skills/cohort roster

Implemented in #4.