test(import[prune]) Add edge-case tests for prune scoping

[tony]

Summary

• Add 3 new prune edge-case tests covering previously untested scenarios
• Test --prune without import_source does nothing (Finding 13)
• Test --sync --prune together is idempotent with --sync alone (Finding 14)
• Test same-name same-source repos across workspaces prune correctly (Finding 1)

Test plan

• uv run py.test -vvv — all tests pass
• uv run mypy — clean
• uv run ruff check . — clean

[tony]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

🤖 Generated with Claude Code

_{- If this code review was useful, please react with 👍. Otherwise, react with 👎.}

[tony]

Rebased onto current master and corrected. During review, test_import_prune_same_source_across_workspaces (Case 1) asserted the opposite of master's intentional, tested behavior: it expected a same-named repo in a non-target workspace to survive as long as the name is still on the remote, whereas master scopes prune to the import target and prunes the stale non-target copy (documented by test_import_prune_cross_workspace_same_source_same_name).

Confirmed with the maintainer that master's scoping is correct, so I fixed Case 1's expectation instead of changing behavior: the target workspace keeps myrepo, the non-target stale copy is pruned; Case 2 (remote returns nothing → both pruned) is unchanged. The other two tests (_without_import_source_does_nothing, _sync_prune_together_idempotent_with_sync_alone) were already correct. No source changes — tests only. Full gate green.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.30%. Comparing base (e6a62d9) to head (510c23e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #533   +/-   ##
=======================================
  Coverage   83.30%   83.30%           
=======================================
  Files          32       32           
  Lines        4492     4492           
  Branches      903      903           
=======================================
  Hits         3742     3742           
  Misses        499      499           
  Partials      251      251           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.