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* feat(comments): roots-only thread stats + summary projection for comment list Enrich the roots_only read so each root carries reply_count (recursive descendant count) and last_activity_at (MAX created_at over the subtree), letting an agent triage which thread to open without fetching any replies. Add an orthogonal summary=true projection (--summary) that clips each returned comment's content to a fixed budget and sets content_truncated, so an agent can scan a list cheaply before pulling a full body. It composes with every read mode (default, since, thread, recent, roots_only). New response fields are optional (omitempty) and only populated for the agent-facing query params, so the default response shape is unchanged for the desktop/web and existing CLI callers. Co-authored-by: multica-agent <github@multica.ai> * test(comments): cover roots_only + summary composition end-to-end The summary projection composing with roots_only is the spec's headline "table of contents" read, but it was only exercised at the CLI param- forwarding level — no handler test asserted that a roots_only response both clips content AND keeps reply_count / last_activity_at. A refactor moving the clip into a per-mode branch would silently break that composition with no failing test. Add TestListComments_RootsOnlySummaryComposes: a long root + a reply, read via roots_only=true&summary=true, asserting the root is clipped (content_truncated=true) while its subtree stats still surface. Co-authored-by: multica-agent <github@multica.ai> * refactor(comments): address review nits on roots stats + summary - ListRootComments[Since]ForIssue: scope the recursive membership walk to a selected_roots CTE (the @row_limit page, with the @since cut applied up front) so stats are only computed over the subtrees of the roots actually returned, instead of every thread in the issue. - summarizeContent: scan by rune and stop at the budget+1th rune instead of allocating a full []rune for the whole body, so a pathologically long comment costs only the budget under summary mode. Add a multi-byte (CJK) test to lock rune-boundary clipping. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: J <j@multica.ai> Co-authored-by: multica-agent <github@multica.ai>