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identifier, or a comment tore the migration into fragments that were no longer
valid SQL — each case verified to produce two fragments where one was required.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/architecture/decisions/0015-static-module-http-routing-and-runtime-lifecycle.md

@@ -127,7 +127,15 @@ decides this mapping, and a module has no way to choose or influence its own mou
 ordering is load-bearing, not cosmetic: Hono's router resolves two routes whose patterns overlap at
 the same depth (a static segment and a same-position `:parameter`) by registration order, not by
 static-path specificity, so preserving the runtime's exact publication order is what lets a module
-author's more-specific-first declaration continue to take precedence after mounting. Mounting uses
+author's more-specific-first declaration continue to take precedence after mounting.
+
+> **Partial correction — see [ADR 0020](0020-module-runtime-and-migration-execution-hardening.md).**
+> Relying on registration order to resolve an overlap let the *permission* guarding an ambiguous
+> path depend on declaration sequence. Core now rejects any two same-module, same-method routes
+> that can both match one request path (`MODULE_ROUTE_OVERLAP`) during staged registration, so no
+> such pair ever reaches mounting and no ordering decides which permission applies. Preserving the
+> publication order of *disjoint* routes, and everything else in this section, is unchanged and
+> still accepted. Mounting uses
 one fixed-arity `app.on(method, path, ...middleware, handler)` call per route rather than spreading
 a variable-length handler array — Hono's overload resolution is arity-sensitive, and a spread call
 silently resolves to an unrelated, incompatible overload.