Warp: Oz attribution toggle, git UX fixes, MCP cwd fixes, model selector cleanups

Improvements

• New AI setting to control whether Oz adds an attribution co-author line to commits/PRs it creates
• Git operation buttons show tooltips explaining why they're disabled
• Long-running command indicator shows countdown to next agent snapshot instead of time since last

Bug fixes

• ~/ expands correctly in warp://action/new_tab and /new_window
• Tab configs sorted alphabetically in + menu and default session dropdown
• Slash commands sent during agent response no longer dropped; they run as follow-ups
• Commit message editor disabled during an in-flight git commit
• Project-scoped file-based MCP servers spawn from repo root (global from ~) so relative commands and pnpm/npm workspace launchers work
• Stopped agent-run metadata fetch spam on WASM shared-session viewer (fixed 403 flood on /api/v1/agent/runs/{id} for non-owners)
• Fixed dropped keystrokes from queued/typeahead command blocks
• Fixed double-line artifacts between workspace panels
• Fixed macOS memory leak accumulating Core Graphics objects during rendering
• Fixed unclickable settings popup items (View as / Density)

Oz updates

• oz CLI tarball ~60% smaller on macOS and Linux
• Model selector hides promotional discounts for BYOK-routed models (discounts only apply to Warp-billed usage)