refactor: simplify paired review system and add reviewer container isolation
Phase 1 — Strip over-engineering (-3,665 lines): - DB tables: 7 → 3 (remove executions, approvals, artifacts, events) - Task statuses: 11 → 5 (active, review_ready, in_review, merge_ready, completed) - Remove plan governance, event sourcing, gate/verdict, freshness guards - paired-execution-context: 980 → 299 lines - Session commands: remove /risk, /plan, /approve-plan, /request-plan-changes Phase 2 — Container isolation for reviewers: - Add container-runtime.ts (Docker abstraction) - Add credential-proxy.ts (API key injection without container exposure) - Add container-runner.ts (reviewer-specific read-only mount + tmpfs) - Add container/Dockerfile + agent-runner (Chromium, Claude Code, Codex) - agent-runner.ts: auto-route reviewer execution to container mode
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