feat: add /deliver skill — automated delivery pipeline

[reshashi]

Summary

Adds a /deliver skill that automates the full delivery pipeline from PR creation to merge:

• State machine tracking: WORKING → PR_CREATING → CI_RUNNING → REVIEWING → APPROVED → MERGING → MERGED | BLOCKED
• CI polling via gh CLI with configurable interval/timeout
• Pluggable quality gates — each gate is an agent .md file with YAML front matter, configurable triggers (always, file_match, min_lines_changed), and blocking/non-blocking modes
• Auto-merge when all blocking gates pass (squash by default)
• Resume support across sessions via persisted state at ~/.gstack/deliver/
• Two bundled agents: verify-app (types, lint, test, build — blocking) and code-simplifier (readability — non-blocking)

Structure

deliver/
├── SKILL.md.tmpl
├── gates.yaml.example
├── scripts/
│   ├── run.sh                 # Pipeline orchestrator
│   ├── delivery-state.sh      # State machine (JSON-backed)
│   ├── ci-monitor.sh          # CI polling
│   ├── gate-runner.sh         # Gate orchestration
│   ├── pr-manager.sh          # PR lifecycle (create/merge/labels)
│   └── agent-registry.sh      # Agent .md loader
└── agents/
    ├── verify-app.md
    └── code-simplifier.md

Usage

/deliver                    # deliver current branch
/deliver feat/my-feature    # deliver specific branch
/deliver --no-merge         # approve but don't merge
/deliver --resume           # resume from saved state
/deliver --status           # show pipeline state

Users configure gates at ~/.gstack/deliver/gates.yaml and drop custom agent .md files in ~/.gstack/deliver/agents/.

Test plan

• Fresh install: /deliver creates ~/.gstack/deliver/ and copies defaults
• CI polling: correctly detects pass/fail/timeout via gh pr checks
• Gate execution: verify-app runs and produces PASS/FAIL/CONDITIONAL PASS
• Auto-merge: PR merges when all blocking gates pass
• Resume: /deliver --resume picks up from saved state
• No project-specific references in any file

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