feat(website): add payoff captions to joins/relationship-diagram/sql-echo

Use the ADR-0047 Ctrl+]-delimited demo caption to narrate the payoff
moment of three casts with a neutral one-liner (no key names): the join
result, the relationship diagram, and the m:n junction expansion. Add a
`caption` step kind to the cast generator. Captions show at the climax
during playback and clear as the cast quits.
This commit is contained in:
claude@clouddev1
2026-06-11 13:54:42 +00:00
parent 946dd88db6
commit 13c9c1bcd9
5 changed files with 1592 additions and 1406 deletions
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