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docs: handoff 21 — ADR-0028 complete

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ADR-0028 (query plans / `explain`) is fully implemented; the
handoff-16 design trio (ADR-0026 / 0027 / 0028) is now closed.

- handoff-21: session summary, the two deliberate deviations
  from handoff-20's plan, test coverage, open clusters.
- requirements.md: QA1 / QA2 ticked.
- CLAUDE.md: the `EXPLAIN QUERY PLAN` deferred-items line
  updated to "implemented per ADR-0028".
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CLAUDE.md
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@@ -184,9 +184,8 @@ not yet implemented:
rebuild-table primitive (ADR-0013) is in place; the grammar
and dispatch are pending.
- **Indexes**: `add index` / `drop index` done (ADR-0025).
`EXPLAIN QUERY PLAN` (QA1 / QA2) is designed in ADR-0028 —
the `explain` prefix command + span-styled plan tree —
but not yet implemented.
`EXPLAIN QUERY PLAN` (QA1 / QA2) implemented per ADR-0028 —
the `explain` prefix command + span-styled plan tree.
- **Modify relationship** (C3a): drop+add covers the use case
today.
- **m:n convenience** (C4): auto-generates a junction table