feat(memory): move Memory into core

[sentry-junior]

Closes #1861.

Move Memory into @sentry/junior as one atomic product cutover.

• move Memory runtime, schema, and migration ownership into core
• enable Memory in app and CLI composition without plugin discovery
• add JuniorAppOptions.memory and the @sentry/junior/memory export
• preserve existing migration journals and data adoption
• keep @sentry/junior-memory as a thin compatibility package
• update the example app, evals, tests, and docs to use core Memory

Deferred cleanup: shared utility consolidation, compatibility package removal, and old route removal.

Verification:

• full @sentry/junior test suite
• @sentry/junior-memory tests (95)
• core, compatibility package, and eval typechecks
• core and compatibility package lint
• production example Nitro build
• file length, migration metadata, test architecture, release alignment, and diff checks

via David Cramer.

--

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Project	Deployment	Actions	Updated
junior-docs	Ready	Preview	Sep 16, 2026 7:46pm UTC

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