fix: harden migration command execution

Two problems in the migration commands: no timeouts, and SQL split on literal
bytes.

`migrations:plan` and `migrations:apply` constructed their connection with
neither a connection deadline nor an operation deadline — a real server reported
`statement_timeout = 0` on the migration connection. Both now default to 10
seconds for the connection deadline, the client query timeout, and PostgreSQL's
own statement_timeout, applied at the one shared construction boundary so a
future call site cannot silently omit them. History reads, advisory-lock
queries, transaction control, migration SQL, and history writes are all covered.
The existing lock-wait deadline, the Pass 2 TLS policy, and Doctor's and the
bootstrap CLI's own timeouts are untouched, and no environment variable or flag
was added.

Explicit client fields do not win under the pinned driver. [email protected].0 builds
parameters as `Object.assign({}, config, parse(config.connectionString))`, so
the URL overrides passed options — verified directly, where an explicit
statement_timeout of 10000 alongside `?statement_timeout=0` produced a
server-reported 0, while a clean URL produced 10s. A DATABASE_URL carrying
connect_timeout, query_timeout, statement_timeout, or an `options` value setting
statement_timeout is therefore refused with the existing fixed configuration
error, before any client is constructed and without echoing the URL, parameter,
or value. Unrelated parameters are left alone.

The runner split each migration on the literal `--> statement-breakpoint` bytes.
Those bytes inside a string literal, a dollar-quoted function body, a quoted
identifier, or a comment tore the migration into fragments that were no longer
valid SQL — each case verified to produce two fragments where one was required.
Each migration's exact SQL is now passed to the client once, with no values and
no prepared-statement name, inside the existing transaction, and its history row
inserted only after that batch succeeds. One transaction still spans all pending
migrations; advisory locking, checksum validation, approval preflight, ordering,
rollback, cleanup, and sanitized error identity are unchanged. The port method
is renamed executeStatement to executeMigrationSql so the contract says what it
receives.

PostgreSQL parses the batch because it owns the only correct parser. A homegrown
splitter would have to track single quotes, dollar quoting with arbitrary tags,
quoted identifiers, line comments, nested block comments, and escape syntax to
answer a question the server already answers, and a parser dependency would add
supply-chain surface for the same reason. Drizzle's marker lines are ordinary
`--` comments when the batch is sent whole. No custom SQL parser exists here.

Co-Authored-By: Claude Opus 5 <[email protected]>

docs/development/testing.md

@@ -163,8 +163,17 @@ Pass 4 introduced several deadlines, and their tests deliberately differ in kind
 - **Real raw-HTTP force-close** (`apps/api/tests/api-http.integration.ts`) binds the real listener,
   opens a real socket, writes a deliberately incomplete request, and proves shutdown force-closes
   it at a short `drainTimeoutMsOverride` and still reaches pool closure.
-Both use a short **test-only override**; the production defaults (10 s per module hook, 30 s HTTP
-drain) are asserted separately as constants and are never waited out.
+- **Real TCP connection timeout** (`core/tests/postgres-migration.integration.ts`) binds a loopback
+  blackhole listener that accepts the socket and never completes PostgreSQL startup, proving the
+  configured connection deadline; the listener and every accepted socket close in `finally`.
+- **Real PostgreSQL operation timeout and SQL batching** (same file) use a bounded server-side
+  delay only because the deadline itself is what is under test, and disposable databases to prove
+  that marker bytes inside literals, dollar-quoted bodies, comments, and quoted identifiers execute
+  intact, and that a failure rolls the whole batch back.
+
+Every one of these uses a short **test-only override**; the production defaults (10 s per module
+hook, 30 s HTTP drain, 10 s migration connection/query/statement) are asserted separately as
+constants and are never waited out.
 
 CI runs the same command in the dedicated `migration-smoke` job. After this change is merged, add
 the following pull-request status context to `main` branch protection: