v3.26.0

Big update since v3.18.0!

What's New

• GitHub Copilot provider — gac auth copilot login to authenticate via device flow and start using Copilot as your commit message generator
• ChatGPT OAuth — gac auth chatgpt login for browser-based auth, now powered by the Responses API
• Interactive staging TUI — gac -S opens a Textual-based file selector so you can pick exactly what to stage
• Editor support — gac editor to pick an editor interactively, or set GAC_EDITOR to use vim/nano/VS Code/etc.
• Stats overhaul — Model usage & speed breakdown, latency comparisons, all-projects view (gac stats projects), weekly activity charts, biggest gac record, reasoning token tracking with v2 schema migration, and per-model reset (gac stats reset --model <name>)
• Think tag support — Reasoning tokens are now extracted and tracked; providers normalize reasoning vs completion tokens

Fixes

• Reasoning content and false zero tokens from providers now handled correctly
• uv lockfiles recognized as generated files
• Token accumulator resets on retry (no more inflated biggest_gac records)
• ChatGPT OAuth model updated to gpt-5.4-mini
• Various stats calculation fixes for reasoning tokens and v1→v2 migration

Full Changelog: v3.18.0...v3.26.0

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