Document AidboxMigration execution-type and improve 2607 release notes

[aleksandrkislitsyn]

Documents running AidboxMigration SQL outside a transaction, added in HealthSamurai/sansara#8102, and reworks the 2607 release notes.

Why

CREATE INDEX CONCURRENTLY (and other DDL PostgreSQL forbids inside a transaction block) previously could not run through any Aidbox migration path. The new execution-type parameter makes it possible, but nothing in the docs mentioned it.

Changes

• configuration/migrations.md — new "Run SQL outside a transaction" section: the execution-type parameter, a value table (in-transaction default vs not-in-transaction), which request contexts allow it (direct POST to either API format and batch bundles work; a transaction bundle is rejected with 422), a batch Init Bundle example, and the no-rollback caveat with the query for finding invalid indexes. Also adds a row to the AidboxMigration vs POST /db/migrations comparison table.
• tutorials/other-tutorials/how-to-run-sql-via-init-bundle.md — switched the main example to CREATE INDEX CONCURRENTLY, since a plain CREATE INDEX locks the table against writes for the duration of the build. That required the bundle type to become batch, the execution-type parameter, and a version bump to 2607. Added a step checking indisvalid, and a note that a failed batch entry warns rather than blocking startup.
• deployment-and-maintenance/indexes/README.md — new "Applying an index" section. The page listed which indexes to create but never how to apply DDL that cannot run in a transaction. Covers $psql with Aidbox-Sql-Autocommit, SQL Console autocommit mode, and AidboxMigration.
• api/rest-api/other/sql-endpoints.md — cross-link from the Aidbox-Sql-Autocommit header row to the migration route.
• overview/release-notes.md — reworked the 2607 section: documentation links throughout, fuller descriptions for SMART Health Cards and batch validation, typo fixes, and formatting matched to the surrounding releases.

Note

The sansara PR description documents the parameter as runInTransaction: false (a valueBoolean), but the merged code implements execution-type as a valueCode with values in-transaction / not-in-transaction. These docs follow the code and tests in proto/migration.clj; the PR description looks stale.

Verification

bun lint passes: 11 checks, no new warnings. All new anchor links verified against their target headings.

🤖 Generated with Claude Code

[Aitem]

LGTM