feat(oas): add object-with-properties-requires-type-object rule

[slegarraga]

Summary

Implements the builtin rule proposed in #2203: schemas that define properties must also declare type: object.

• Rule id: object-with-properties-requires-type-object
• recommended: false (opinionated; opt-in like other style rules)
• resolved: false (type belongs on the schema node, not on $ref targets)
• Regression tests for OAS2 + OAS3

Why

Without type: object, JSON Schema validation does not restrict instances to objects — strings/booleans can pass unexpectedly when only properties is set.

Test plan

• yarn jest packages/rulesets/src/oas/__tests__/object-with-properties-requires-type-object.test.ts

Closes #2203

Made with Cursor

[slegarraga]

@maintainers Friendly nudge — rolling review welcome. Rule is opt-in (recommended: false) per #2203 discussion; happy to flip to recommended or adjust JSONPath if you prefer a stricter oas3.1 type: [object] case.

[slegarraga]

Ready for review when you have bandwidth — mergeable, Wiz CI green, tests added. Closes #2203. Thanks.

[slegarraga]

@tomek-tursa-sb Hi — you merged #2934 last week; this follow-up adds the opt-in rule from #2203 (tests + docs). Mergeable, Wiz green. A review when you have a cycle would be appreciated. Thanks.

[slegarraga]

Local jest on rule tests: 5/5 pass. Branch is mergeable; let me know if you want this marked recommended: true before merge. Thanks.

[slegarraga]

Related: #2962 (OAS 3.1 bearer scopes) — same ruleset area if useful to batch review.

[slegarraga]

Ready for merge — closes #2203, MERGEABLE, CI summary ✅, local rule tests pass.

Opt-in rule (not recommended: true unless you want it default-on). Happy to flip that flag in a follow-up commit.

[slegarraga]

@tomek-tursa-sb Batch review request when you have a cycle — three small Spectral PRs from the same contributor window:

PR	What
#2963	Hotfix: null guard regression from #2934 → fixes #2959 crash (9 tests)
#2961	New opt-in rule object-with-properties-requires-type-object → closes #2203
#2962	OAS 3.1 bearer scopes on operations → closes #2643

All MERGEABLE, Wiz green. #2963 overlaps #2960 — land either for the null guard. Thanks again for merging #2934.