Add tests for pretext build -g (force asset regeneration)

[Copilot]

pretext build -g had no test coverage, which allowed a behavioral regression to ship in the 1.2 release undetected.

Changes

• New test test_build_generate in tests/test_cli.py covering all documented behaviors of the generate/no-generate flags against the existing graphics example project (asymptote + prefigure assets):
  • build -q → assets skipped entirely
  • build -g → assets force-generated regardless of prior state; build output produced
  • build after build -g with source unchanged → hash matches, deleted asset stays missing (caching works)
  • build -g after hash is saved → still regenerates unconditionally
  • build -g -q together → warning emitted, flags cancel out, behaves like normal build

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• runestone.academy
  • Triggering command: /usr/bin/python3 python3 scripts/fetch_core.py (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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Original prompt

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This section details on the original issue you should resolve

<issue_title>Add pretext build -g to tests</issue_title>
<issue_description>No time to look into it now, but the behavior of this command must be different than what we are testing, since it caught us on the 1.2 release. See https://groups.google.com/g/pretext-dev/c/klKMunE1kAg</issue_description>

Comments on the Issue (you are @copilot in this section)

@oscarlevin Not sure the status of this, since the issue is very old. Check the generate documentation in docs to see expected behavior and write better tests.

• Fixes Add pretext build -g to tests #377

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