DeployBot v0.2.8

What changed

• preserves release takeover after an empty-queue wake-up
• follows only when exact-main CI, deployment, failure handling, or final completion still needs an owner
• skips idle all-mode integration batches instead of holding the coordinator for the full timeout
• adds direct regression coverage for both the takeover and all-mode paths

Verification

• 91 tests across Python 3.11, 3.12, and 3.13
• optional MCP-free install verified (89 passed, 2 optional skips)
• Ruff and package build passed