New artisan command brain:reindex {--all} {--chunk=100} that dispatches
the EmbedMemory job for brain memories needing (re)indexing. Without
--all, only memories where indexed_at IS NULL are dispatched; --all
re-embeds every memory (useful after a Qdrant collection wipe or
embedding model change). Uses chunkById for memory-safe iteration at
scale.
php/tests/Feature/Console/BrainReindexCommandTest.php covers Good
(unindexed-only default), Bad (invalid chunk), Ugly (--all flag).
Co-authored-by: Codex <noreply@openai.com>
Closes tasks.lthn.sh/view.php?id=60
