- dangling_suppress_warnings takes an ApplyOwner and walks the group's own
chain (GROUP_CHAIN_LEVELS_CTE) for a group node; runs for both owners.
- GET /groups/{id}/suppressions + `pic suppress ls --group` (client + cmd +
main.rs; --app/--group mutually exclusive).
- suppress journey: a child group declines a parent template for its subtree;
suppress ls --group shows the marker. Docs §4.5 + CLAUDE.md move group-level
suppression from Deferred to implemented.
Completes M1. (An unrelated pre-existing email_inbound dispatch-timing flake
passes in isolation.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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