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## New Features - Combo Builder v2 wizard UI (multi-stage: Basics → Steps → Strategy → Review) - Combo Step Architecture Schema v2 (ComboModelStep, ComboRefStep, pinned accounts) - Composite Tiers system for tiered model routing with fallback chains - Model Capabilities Registry (unified resolver merging specs + registry + synced data) - Observability module (buildHealthPayload, buildTelemetryPayload, buildSessionsSummary) - Session & Quota Monitor panels on Health dashboard - Combo Health per-target analytics via resolveNestedComboTargets() - Combo Builder Options API (GET /api/combos/builder/options) ## Performance - Middleware lazy loading (apiAuth, db/settings, modelSyncScheduler) - E2E auth bypass mode (NEXT_PUBLIC_OMNIROUTE_E2E_MODE) ## Bug Fixes - P2C credential selection with quota headroom awareness - Fixed-account combo steps bypass model cooldowns/circuit breakers - Combo metrics per-target tracking (byTarget with executionKey) - Call logs schema expansion (7 new columns + composite index) - Quota monitor lifecycle enrichment (status, snapshots, summary) - Codex quota fetcher hardening ## Maintenance - DB migration 021 (combo_call_log_targets) - Combo CRUD normalization on read - Playwright config + build script improvements - OpenAPI spec version sync to 3.6.4 ## Tests - 16 new test suites + 12 existing test updates - 86 files changed, +8318 -1378 lines