chore(deps): adopt @query-doctor/core ^0.21.0

[veksen]

Goal

The analyzer resolves @query-doctor/core from npm, which served 0.20.0 while seven commits sat unpublished on Site's staging. Query-Doctor/Site#3877 published 0.21.0. This adopts it.

What

Three of the seven commits change work the analyzer does: the workflow setup_ci emits, the echoed-argument detection, and where LIMIT_WITHOUT_ORDER_BY is reported. Until this lands, the analyzer runs without them.

How

package.json moves from ^0.20.0 to ^0.21.0, and package-lock.json resolves to 0.21.0. Nothing else changes.

0.21.0 is a minor rather than a patch because packages/core/src/index.ts gained two export lines since 0.20.0, ./sql/pg-stat-statements.js and ./ci/workflow-template.js. A caret on 0.20.0 stops below 0.21.0, so the range had to move.

Tests

npm run typecheck clean. Full suite 436 passed across 43 files, against the published 0.21.0 rather than a workspace copy.

[github-actions]

Query Doctor — 6 successful checks

 Cost regression — No query went up more than 5%
 Untested data access — No changed data-access file without a test
 New query — No new queries
 New query with index recommendation — No new query ships an index recommendation
 Schema drift — No schema changes
 High-value nudge — No index or rewrite past the threshold

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_{More details via MCP → get_ci_run({ runId: "019fd30c-1eeb-73b7-9400-735c5fd35a0f" }) · view run · docs
3 queries read against main on assumed statistics of 10,000,000 rows per table. Sync production stats for costs measured against your real data.}