Migrate prose and doc-comments to describe the Postgres FTS backend that
replaced Typesense: README architecture diagram (3 boxes, Postgres now
"events + FTS search"), ARCHITECTURE.md buzz-search section rewritten to the
real API (SearchService::new(pool), search(&SearchQuery), ChannelScope) and
the search_tsv generated-column mechanism (CASE WHEN kind IN (1059,30300,30622)
THEN NULL, idx_events_search_tsv GIN), CONTRIBUTING step-6, VISION, AGENTS,
TESTING (both), and the chart README. Comment-only edits in desktop and
test-client files; drop the dead reindex-kind0 Justfile recipe (its binary no
longer exists).
Co-authored-by: Tyler Longwell <tlongwell@block.xyz>
Signed-off-by: Tyler Longwell <tlongwell@block.xyz>
The `format_log` function parses PR numbers from commit subjects via a
`grep -oE` pipeline. Commits without a PR suffix (e.g. "Update README.md")
cause `grep` to exit 1, which `set -euo pipefail` promotes to a script
failure — even though the empty-match case is already handled.
