project_id/team_id become project_ids/team_ids (list[int] or None).
Every internal filter uses the __in lookup; M2M filters use the
id__in subquery pattern documented in CLAUDE.md's Django ORM gotcha.
generate_report and generate_report_pdf switch to request.GET.getlist.
Old URL ?project=1 still works - getlist returns a single-element list.
Return dict gains six hero-KPI keys: current_outstanding, current_as_of,
company_avg_daily, company_avg_monthly, company_working_days,
team_project_activity - ready for the template restructure in Tasks 9-12.
Tests: 3 new multi-filter tests; existing inflation tests updated to the
new kwarg names. 42 total, all pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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