Support non-interactive updates with --yes

[zerone0x]

Summary

Fixes #9501

• add omarchy update --yes as the long form of the existing unattended -y mode
• replace the confirmation TUI with a plain-text summary while retaining the complete update pipeline
• prevent orphan cleanup, reboot checks, and interactive migrations from prompting inside the transcript pseudo-terminal
• document unattended updates and their sudo requirements

Test plan

• bash test/shell.d/update-sequence-test.sh
• bash test/shell.d/update-disk-space-test.sh
• bash test/shell.d/update-orphan-test.sh
• bash test/shell.d/update-restart-test.sh
• bash test/shell.d/copy-url-shortcut-migration-test.sh
• ./test/cli (passes through command metadata and routing checks; host lacks the later python dependency)
• ./test/shell (all changed update/migration tests pass; aggregate has 22 unrelated host dependency/checkout failures, including missing Lua, gio, and omarchy-pkgs)
• git diff --check