refactor: rename the collection bootstrap skill to setup-vstack

[vuon9]

Why

The bootstrap skill keeps the skill collection in sync, but its old name (set-it-up) described a generic action and did not say what it set up. Renaming it to setup-vstack ties the skill to this collection, so the command and the repo read as one thing.

• Renames the skill folder, frontmatter name, and all live references (docs, workflows, plugin manifest, type-check path, tests, eval docs).
• Leaves the historical eval trace fixtures under tests/eval/fixtures/ untouched, since they record completed runs.
• Adds AGENTS.md documenting commands, CI-enforced manifest invariants, and release conventions for contributors and agents.

Verification: python3 -m unittest discover -s tests (26 tests) and python3 setup-vstack/scripts/verify.py both pass.

💘 Generated with Crush

[github-actions]

This PR renames the bootstrap skill set-it-up → setup-vstack (folder, setup-vstack/SKILL.md:2 frontmatter, workflows, .claude-plugin/plugin.json:7, pyrightconfig.json:7, docs, tests) and adds AGENTS.md:1; eval fixtures untouched. No skills added/removed/re-scoped in setup-vstack/skills.json.

Required: setup-vstack/skills.json:18,88,100,105,132,145,163 required:true set (7: brainstorming, wayfinder, test-driven-development, unslop, hunk-review, requesting-code-review, receiving-code-review) matches vmode/SKILL.md:37-43 in both directions — no drift.

Manifest: 34 entries have valid name/source/scope; mine sources all vuon9/* (setup-vstack/SKILL.md:3, vmode/SKILL.md:2), folder/frontmatter names align; source formats are owner/repo or GitHub tree URL.

Local: setup-vstack/vmode/skills/* all have name ^[a-z0-9-]+$, description starts "Use when", README.md present (skills/automate-me/SKILL.md:2, skills/bro/SKILL.md:2, etc.).

Non-blocker: .claude-plugin/plugin.json:6-15 omits skills/automate-me (noted in AGENTS.md:16) — no manifest/required mismatch, so no fix needed (if drifted: python3 setup-vstack/scripts/manage.py set-required <name> true).

Verdict: PASS — verify.py/test_skill_contracts.py invariants hold.

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