* fix: prevent merged PRs from showing "Merge conflicts" status
GitHub returns `mergeable: null` for merged/closed PRs. The SCM plugin
was misinterpreting this as unknown/problematic status, leading to
false "Merge conflicts" warnings in the dashboard.
Fixed in two layers:
1. SCM plugin: Check PR state first in getMergeability(). Return clean
result immediately for merged/closed PRs without querying mergeable.
2. Dashboard: Skip merge conflict display for non-open PRs in
SessionDetail component.
SessionCard already had protection via early return in getAlerts().
Closes: bug described in task description
Tests: Added tests for merged/closed PR cases, all 54 tests passing
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* fix: only skip mergeability checks for merged PRs, not closed PRs
Addresses review comment: A closed-but-unmerged PR should still have
its mergeability checked accurately. Only merged PRs should skip the
checks since they're already merged.
Changes:
- SCM plugin: Only return clean status for state === "merged"
- Dashboard: Show conflicts for closed PRs (pr.state !== "merged")
- Tests: Updated to verify closed PRs still get checked
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
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