describe ends every statement with ';' and never emits '/' (valid under mdl 0 and mdl 1)

[ako]

Part of plan item 2.6 (canonical describe, ADR-0010 R11 and R12). This blocks #741 (strict parsing), whose mdl 1 rules reject what describe prints today:

• About 20 document types end with a SQL*Plus / line (emitted in 15 files: agents, knowledge bases, MCP services, models, constants, contracts, associations, DB connections, entities, enumerations, image collections, modules, OData, published REST, security).
• Pages, snippets and layouts end with a bare } and no ;.

As a result, tests that run describe output under mdl 1 fail as soon as #741 is combined with #737 and #740, for example TestPedAppListActivitiesUnderMdl1 and TestPedAppRoundTrip_RetrieveRange.

Scope

• Every statement describe emits ends with ;, and no / line is emitted, for every document type. Blank lines between statements are fine. The output must be valid under both mdl 0 (where ; was always accepted) and mdl 1.
• Update the tests that assert the old / or unterminated output.
• Check the round-trip test (go test -tags integration ./mdl/roundtrip/). The allowlist may only shrink.
• Add a test that runs every document type's describe output from PedApp through the mdl 1 parser and expects no strictness errors. It must fail on today's output.