test(plugin-dev): drop the redundant driver-memory mock the census ledger locks (#15232)

`check:driver-memory-census` counts `vi.mock` as a DECLARATION, and that
package's consumer set is locked by maintainer ruling (#5499 froze investment,
#5704 / #6664 ruled each remaining consumer at two). The mock copied in from
this package's sibling harnesses made this file a third consumer.

⛔ Not ledgered — MIGRATED, which here means deleted: the line was redundant.
`dev-plugin.ts` has exactly one `import('@objectstack/driver-memory')` and it
sits inside `if (enabled('driver'))`, while both boots in this file pass
`services: { driver: false }`, so the specifier was never reached. Measured
rather than argued: with the line gone the suite is unchanged at
`7 passed (7) / 68 passed (68)`, both BOOT cases green (5ms / 1ms), and the
census gate returns to `OK — 2 ruled consumers` with its ledger untouched.

A comment stands where the mock was, so the next author copying the sibling
harness does not re-add it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHvF5hyiZjnCyExFnfQB8m

Author: claude

packages/plugins/plugin-dev/src/dev-i18n-packages-reader.test.ts

@@ -54,7 +54,17 @@ vi.mock('@objectstack/service-i18n', () => ({
 
 vi.mock('@objectstack/objectql', () => { throw absent('@objectstack/objectql'); });
 vi.mock('@objectstack/runtime', () => { throw absent('@objectstack/runtime'); });
-vi.mock('@objectstack/driver-memory', () => { throw absent('@objectstack/driver-memory'); });
+// ⛔ NO `@objectstack/driver-memory` mock here, deliberately — do not copy one in
+// from the sibling harnesses. `vi.mock` counts as a DECLARATION to
+// `scripts/check-driver-memory-census.mjs`, and that package's consumer set is
+// locked by maintainer ruling (#5499 froze investment, #5704 / #6664 ruled each
+// remaining consumer). A third test consumer is the #6664 defect itself, not a
+// bookkeeping chore. Nothing here needs it: every boot below passes
+// `services: { driver: false }`, and `dev-plugin.ts`'s ONE
+// `import('@objectstack/driver-memory')` sits inside `if (enabled('driver'))`,
+// so the specifier is never reached. Measured, not assumed: with the line gone
+// this suite is unchanged at 68 passed, both BOOT cases below green in 5ms and
+// 1ms — timings a real `import()` of that package would not fit in.
 vi.mock('@objectstack/service-storage', () => { throw absent('@objectstack/service-storage'); });
 vi.mock('@objectstack/service-realtime', () => { throw absent('@objectstack/service-realtime'); });
 vi.mock('@objectstack/plugin-auth', () => { throw absent('@objectstack/plugin-auth'); });