Two clean, local dedups in the group shared-collection services:
- Extract `GroupKvServiceImpl::check_value_size` — `set` and `set_if` inlined
the identical encode-and-cap block; now one method (mirrors the sibling
`group_docs_service::check_data_size`).
- Add `group_collection_repo::best_effort_emit_shared` — the KV/docs/files
services each copied the same emit-and-log-on-error tail for shared-collection
triggers. Centralize the tail (logging the event's own `source`/`op`); each
service still builds its own `ServiceEvent` (payload shapes differ).
Pure refactor, pinned by the existing group-service unit tests. (The
`owning_group` resolver was evaluated for dedup too but left as-is: the five
error enums diverge — `GroupFilesError::InvalidCollection` carries a `String`,
`GroupPubsubError` lacks the variant, and files/pubsub skip the empty-check kv/
docs/queue do — so a shared conversion would be a behavior change, not a
refactor.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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