Phase 1: Add source_entity_iid to search results via CASE subquery on
hydrate_results() for all 4 source types (issue, MR, discussion, note).
Phase 2: Fix visual alignment - compute indent from prefix visible width.
Phase 3: Show compact relative time on title line.
Phase 4: Add drill-down hint footer (lore issues <iid>).
Phase 5: Move labels to --explain mode, limit snippets to 2 terminal lines.
Phase 6: Use section_divider() for results header.
Also: promote strip_ansi/visible_width to public render utils, update
robot mode --fields minimal search preset with source_entity_iid.
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