docs(adr): /runda DA cleanup — reflect Phases 1-3 done, pin Bucket C

Surfaces from a Devil's-Advocate audit of the DSL → SQL teaching echo
(ADR-0038) after Phases 1-3 landed: three doc-drift bugs introduced
by the earlier handoff-47 / ADR-promotion commits — requirements.md
M4 and both ADR-0038 README index entry + Status block still said
"Phase 2 / Phase 3 remain," but `275c726` and `e6ad1ae` shipped them.
Updated to reflect actual state: Buckets A + B complete plus the
category-3 prose; only the §4 styled-runs polish remains. ADR-0037's
README entry also touched to note all four shipping commits of its
consumer.

Plus a missing test slice the DA flagged: explicit no-echo coverage
for the Bucket C cases that flow through command_to_sql's catch-all
(show table, explain, replay, every Command::App variant). The
contract — ADR-0030 §10 / ADR-0038 §7 Bucket C — forbids echoes for
these; a future renderer arm added at the wrong place could silently
leak one. The new bucket_c_no_echo_commands_all_return_none pins
that.

Tests: 2015 passed / 0 failed / 1 ignored (pre-existing); clippy
clean. Nothing to escalate.

docs/adr/0038-dsl-to-sql-teaching-echo.md

@@ -2,25 +2,42 @@
 
 ## Status
 
-Accepted. Design agreed with the user (2026-05-27); **Phase 1 (Bucket A)
-implemented and verified** by round-tripping every single-statement DDL
-row + `show data` + the `--all-rows` fall-throughs through the
-advanced-mode walker (the §1 copy-paste contract). Phase 1 shipped in two
-commits: handoff-46's `04c8e42` (channel + create-table slice; ADR-0037 +
-this ADR) and handoff-47's `90479cb` (the renderer's full Bucket A
-expansion — `Value → SQL-literal` + `Expr → SQL`, `add`/`drop`/`rename`/
-`change column`, the four `add constraint` + two `drop constraint` forms,
-`show data [where] [limit]` with PK-sourced `ORDER BY`, and the
-`delete`/`update … --all-rows` fall-throughs; also fixed a contract gap
-in the skeleton's create-table echo that silently dropped per-column
-`DEFAULT` / `CHECK`). **Phase 2 (Bucket B — resolved-name + multi-line
-echoes), Phase 3 (category-3 prose expansion), and the §4 de-emphasised
-styled-runs rendering polish remain** — see §8 phasing + handoff-47 §5.
-**Realises ADR-0030 §10** ("The DSL → SQL teaching bridge") — the Phase-5
-echo that **ADR-0035 §12 forward-referenced** as "a separate ADR." Builds
-on **ADR-0037** (the execution-time mode side-channel that gates it) and
-**ADR-0035 Amendment 2** (the standard-first dialect + `ALTER COLUMN`
-gap-fill that makes its DDL echoes runnable).
+Accepted. Design agreed with the user (2026-05-27); **Phases 1–3
+implemented and verified** by round-tripping every catalogue row
+(§7 Buckets A, B, plus the §6 category-3 prose) through the
+advanced-mode walker (the §1 copy-paste contract; §6 category 2
+holds it per line). Shipped across three feature commits:
+**Phase 1 — Bucket A single-statement** (handoff-46's `04c8e42`
+delivered the channel + create-table slice; handoff-47's `90479cb`
+expanded to the full Bucket A — `Value → SQL-literal` + `Expr → SQL`,
+`add`/`drop`/`rename`/`change column`, the four `add constraint` +
+two `drop constraint` forms, `show data [where] [limit]` with
+PK-sourced `ORDER BY`, and the `delete`/`update … --all-rows`
+fall-throughs; also fixed a skeleton contract gap that silently
+dropped per-column `DEFAULT` / `CHECK` on the create-table echo).
+**Phase 2 — Bucket B resolved-name and multi-statement** (`275c726`):
+`add index` (auto- and user-named, resolved from the post-execution
+description), positional `drop index`, `add`/`drop relationship` in
+both `Endpoints` and `Named` selector forms (the named drop
+resolved by a small list-tables scan, acceptable for teaching-
+playground schemas), `drop column --cascade` (multi-line via
+`DropColumnResult::dropped_indexes`), and `add relationship
+--create-fk` (multi-line iff the child column was newly created;
+parent PK type + pre-state captured pre-execution via the runtime's
+new `collect_echo_lookups`). **Phase 3 — category-3 prose**
+(`e6ad1ae`): `shortid` generation and type-conversion transforms
+already surfaced via the pre-existing `client_side.auto_fill_*` /
+`client_side.transformed*` notes — Phase 3 only added the missing
+`change column --dont-convert` **caveat** (the only Bucket A
+caveat; every other category-3 line is illuminating), gated on an
+advanced effective mode because it references "the line above".
+**The §4 de-emphasised styled-runs rendering polish remains** — the
+echo + caveat currently surface as plain `[system]` lines.
+**Realises ADR-0030 §10** ("The DSL → SQL teaching bridge") — the
+Phase-5 echo that **ADR-0035 §12 forward-referenced** as "a separate
+ADR." Builds on **ADR-0037** (the execution-time mode side-channel
+that gates it) and **ADR-0035 Amendment 2** (the standard-first
+dialect + `ALTER COLUMN` gap-fill that makes its DDL echoes runnable).
 
 ## Context