OpenChrome v1.12.8

Broker auto-election and reliability hardening release on top of v1.12.7.

Highlights

Broker Auto-Election (#1480)

Multi-instance setups now self-heal without manual intervention. When the broker owner process dies or becomes a half-zombie, surviving instances automatically elect a new owner and re-attach — no more deadlocks waiting for a ghost lock.

• broker: auto-elect lock winner as broker owner (93ff0ac)
• broker: auto-elect loser attaches to owner broker (d4f87e5)
• broker: re-elect when broker owner dies (e9439b5)

Health-Aware Controller Lock (#1474)

The controller lock now detects half-zombie owners (process alive but unresponsive) and proactively takes over, eliminating the deadlock scenario where all workers stall waiting for a stuck owner.

• reliability: health-aware controller lock — take over half-zombie owner instead of deadlocking (#1477)
• reliability: release controller lock after Chrome death (1af956e)

DuplicateController Surfacing

DuplicateController errors are now surfaced over MCP as actionable diagnostics instead of being silently swallowed, making multi-instance conflicts visible to agents and operators.

• observability: surface DuplicateController remediation over MCP (25e0297)

Fixes

• cli: expose broker flags in serve --help + forward unknowns (I1 of #1480, #1482)
• chrome: reap orphaned headed-fallback Chrome via ownership marker (I2 of #1480, #1483)
• cli: warn when setup migration is required after updates (#1491)
• schemas: enforce array items in tool schemas (880b2c3)
• extract_data: add items to alreadyCollected array schema (#1473, #1475)

Docs

• explain update vs MCP host config migration (#1490)
• amend D3 — opt-in auto-elect coordinated sharing path (S1 of #1480, #1481)

CI

• keep PR CI from saturating macOS runners (4979348)

Full Changelog: v1.12.7...v1.12.8

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