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Add comprehensive E2E test suites covering: - Full agent lifecycle (spawn → running → completed/failed) - 7 tests - Killswitch emergency stop mechanism (single/all/partial) - 5 tests - Concurrent agent spawning and isolation - 5 tests Includes vitest config for integration test runner with 30s timeout. Fixes #226 Fixes #227 Fixes #228 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>