[rasuvaeff]

Partially addresses #165

Stripe's spec3.json exhausted a 10 GiB PHP limit while compiling response schemas. Profiling showed monotonic growth from Opis schema graphs retained for every compiled root; effectiveSchema() itself was not the dominant allocation site.

This change:

• avoids re-resolving Path Item parameters, request bodies, and responses;
• interns identical reference-free schema nodes across compiled roots;
• adds regression coverage for resolver budgets and schema graph sharing.

Validation:

• make build (946 tests, 4552 assertions)
• make rector
• git diff --check
• Stripe profile: 612 operations, about 109 s, 5.87 GiB peak with a 10 GiB PHP limit

This improves peak memory, but does not yet meet the issue's single-digit-second target. Issue #165 remains open for that work.

[coderabbitai]

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