feat(mcq): enlarge and maximize image previews in Gtk dialogs

[ajlennon]

Summary

• When image/images are present, open the Gtk MCQ large (~70%+ of the largest monitor) instead of a ~320px-stuck preview.
• Add header maximize / F, and click-preview to toggle large ↔ compact (~320px). Text-only MCQs stay compact.
• Document in docs/AGENTS.md + skill (mcq-with-image).

Hosts / platforms touched

• Cursor (Linux Gtk)
• Claude Code
• Claude Desktop / other stdio host
• Windows Phase 1 (tkinter text-only)
• Docs only (no behaviour change)

Test plan

CI must stay green (test, secrets-hygiene). Also say what you ran:

Check	Result	Notes
uv run python scripts/test_match_transcript.py	Skip
uv run python scripts/test_doctor.py	Skip
uv run python scripts/test_acks.py	Skip
uv run python scripts/test_install.py	Skip
uv run python scripts/test_dialog_ergonomics.py	Skip
uv run python scripts/test_windows_backend.py	Skip
uv run python scripts/test_contracts.py	Pass
uv run python scripts/test_mcq_images.py	Pass
check_setup in a real host	Skip
ask_multiple_choice dialog click	Pass	Direct ask_zenity from worktree
Image preview in Gtk dialog (image/images)	Pass	2400×1800 beauty still; Alex: “Feels right”
Keyboard 1–8 / Enter / Esc	Skip
Freeform / Something else	Skip
Speak / duck (if claiming voice)	Skip	text-only prefs
Maximize / click-preview	Pass	Alex confirmed UX

Environment: Ubuntu Linux, Cursor host, local DISPLAY=:0, worktree /data_drive/dd/ask-question-mcp-mcq-image-max, largest monitor 3840×2160.

Behaviour contract

• No removal/rename of MCP tools without a migration note (ask_multiple_choice, check_setup, setup_guide, record_platform_feedback)
• Cursor absolute-uv docs kept (GUI thin PATH)
• No lab IPs / home paths / secrets in tracked files
• If adding a host: update Tested platforms table (Verified vs Not yet reported must match your results)

AI assistance

• Human-authored
• AI-assisted (Cursor) — unit tests + interactive image maximize smoke; Alex confirmed UX and approved this PR create

Made with Cursor