Serialises distinct (project_id, team_id) pairs from WorkLog as JSON on
the generate_report context. The upcoming pill-popover JS (Task 4 of the
inline-filters plan) uses this to hide teams that haven't worked on a
selected project (and vice versa) without any extra HTTP round-trips.
Scope: entire history (not the report date range) — cross-filter is about
data possibility, not data shown in this period. Filters out NULL
project or team (can't cross-filter on NULL).
2 tests cover: key is populated with correct pairs; NULL-team logs don't
leak into the pairs list.
No visible behaviour change — template doesn't consume the new key yet.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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