v0.2.70

Add local GitHub Copilot session shutdown/checkpoint and existing OTel collection, cumulative/replay reconciliation, and unattributed AI credits. Preserve Codex Flex tiers and selected TOML profiles through daily-v1 uploads; use server-owned Fast/Flex rates. Add Antigravity ACP discovery and correct requestless Claude response deduplication. No telemetry or export setup is enabled. Verified with official upstream fixtures, 172 tests and package validation.