fix(sandbox): omit --user when os.getuid is unavailable

[kurosawareiji7007-hub]

what changed

sandbox docker argv only adds --user uid:gid when os.getuid / os.getgid exist. on windows the flag is omitted so argv construction no longer raises.

why

sandboxed dual-solve crashed with AttributeError on windows before docker ever ran (#582).

validation

python -m pytest tests/test_sandbox.py -q
python -m ruff check src/vouch/sandbox.py tests/test_sandbox.py
python -m mypy src/vouch/sandbox.py

Fixes #582

Summary by CodeRabbit

• Bug Fixes
  • Fixed sandboxed Docker command generation on Windows and other environments where user/group ID functions may be unavailable.
  • Docker run commands now only include the optional --user UID:GID mapping when both values can be retrieved, avoiding command-building errors.
• Documentation
  • Updated the unreleased changelog to describe the Windows-specific fix.

[coderabbitai]

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Review details

⚙️ Run configuration

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Review profile: CHILL

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Run ID: 3fb9e9b3-b20d-4c76-8556-2325ad4f55db

📥 Commits

Reviewing files that changed from the base of the PR and between b703354 and f29e2ea.

📒 Files selected for processing (2)

• CHANGELOG.md
• tests/test_session_transcript.py

Walkthrough

Changes

Sandbox Docker argv

Layer / File(s)	Summary
Conditional Docker user flag src/vouch/sandbox.py, tests/test_sandbox.py, CHANGELOG.md	Docker argv construction adds --user UID:GID only when both UID/GID functions are available and callable. Tests cover unavailable functions, and the changelog records the Windows-specific fix.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main sandbox fix and matches the changeset.
Linked Issues check	✅ Passed	The code omits --user when getuid/getgid are unavailable and adds regression tests as requested.
Out of Scope Changes check	✅ Passed	All changes support the Windows sandbox fix; the changelog update and tests are in scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@tests/test_sandbox.py`:
- Around line 57-61: Update the test around the sandbox user-argument assertions
to use callable(getattr(...)) for both os.getuid and os.getgid, matching the
implementation’s availability check. Parameterize the regression cases so getuid
and getgid are removed or made unavailable independently, covering each
partial-availability combination instead of only removing both together.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 99446498-5cb8-431c-a2e0-532b5a260b2a

📥 Commits

Reviewing files that changed from the base of the PR and between 1fe8fb5 and 874651c.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/vouch/sandbox.py
• tests/test_sandbox.py

[kurosawareiji7007-hub]

rewrote commit history to remove the Co-authored-by: Cursor trailer.

[kurosawareiji7007-hub]

addressed coderabbit: tests now use callable(getattr(...)) like the implementation, and cover missing/non-callable getuid / getgid independently. no cursor trailer.