[braboj]

base-oop leaves the core tier. Chains whose code has no classes stop carrying it, and a project that applies OO design declares it in Extras.

Before → after:

core: [base-quality, base-git, base-docs, base-testing, base-review, base-oop]
core: [base-quality, base-git, base-docs, base-testing, base-review]

Change	Where
Decision record, supersedes ADR-046	docs/decisions/057-object-oriented-design-guidance-is-opt-in.md
ADR-046 status: Superseded, superseded_by: ["057"], date	supersession metadata only
GoF catalogue → use a named pattern where it fits; name it in code	core/oop.md, Design patterns
AOP-framework ban → keep cross-cutting behaviour visible at its call site	core/oop.md, base-oop-aop retitled "Cross-cutting concerns"
SOLID, object design, restraint rewritten as short rules, same substance	core/oop.md
Core-tier listing regenerated	05-building-block-view.md
Migration-guide row	docs/migrating-to-v3.md

• Reach on main: oop.md in 41 of 41 roots; after: its own root only, now refactor(backend): retire backend-quality; its general rules join http (#2085) #2102 has retired backend-quality
• All three section IDs keep their names; the file path stays
• Lands before the tag: ADR-051 freezes core-tier membership at 3.0.0
• Strength: no SHOULD or MAY before or after; "more than two levels is a signal" stays a signal, not a cap
• Fork side: Imbra-Ltd/imbra-ai-templates#61

Score	Before	After
oop	82.8	96.0

Checks

• Smoke 35/35, ADR-01; conformance 12 passed, 0 failed, 1 not applicable; readings read
• Fork sync, release self-test, redundancy audit, resolve, sync_docs --check, score ratchet
• markdownlint, pre-commit hooks

Closes #2087.

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