Summary

Adds regression guard tests for the lazy registry promotion pattern introduced by PR #1089 and fixed by PR #1116. These tests would have caught the ensureTypeLoaded() regression before it reached UAT.

Category 1: Registry invariant tests (8 tests, fresh instances)

Documents the contract that get() returns undefined for lazy entries and ensureTypeLoaded() must be called to promote them. One positive + one negative test for each of the four registries (vault, datastore, driver, report). These pass regardless of the fix — they test the registry itself, not consumers.

Category 2: Consumer regression tests (2 tests, global singletons)

Verifies that resolveVaultType() and resolveDatastoreType() promote lazy entries so callers can safely use get() afterwards. The critical assertion:

// After resolution, get() must return the type — not undefined.
const result = vaultTypeRegistry.get(typeName);
assertNotEquals(result, undefined,
  "get() must return the type after resolveVaultType() — " +
  "if this fails, resolveVaultType() is not calling ensureTypeLoaded()");

Without PR #1116: resolveVaultType() calls has() (returns true for lazy) and returns true, but never calls ensureTypeLoaded() — so get() returns undefined and the test fails.

With PR #1116: resolveVaultType() calls ensureTypeLoaded() first, promoting the lazy entry — so get() returns the type and the test passes.

Test Plan

• deno run test integration/lazy_registry_promotion_test.ts — 10 passed, 0 failed
• deno check — clean
• deno lint — clean
• deno fmt --check — clean

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