feat(http): support deepObject query style

[souloss (souloss)]

Fixes #4440

Summary

• Add style: "form" | "deepObject" to @query options.
• Default deepObject query parameters to explode: true and emit valid OpenAPI 3 parameter attributes.
• Preserve deepObject when converting OpenAPI 3 parameters back to TypeSpec.
• Serialize deep-object parameter examples using bracket notation.
• Carry the style through HTTP canonicalization and add regression coverage.

Validation

• @typespec/http: build, lint, and 414 tests passed.
• @typespec/openapi3: build, lint, and targeted parameter/example tests passed (478 tests).
• @typespec/http-canonicalization: build, lint, and 47 tests passed.

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[Copilot]

🔵 Needs a closer look

The .chronus feature entry should include a short illustrative code snippet per the repo’s changelog guidelines.

Pull request overview

This PR adds first-class support for OpenAPI’s deepObject query parameter style across the TypeSpec HTTP library, the OpenAPI 3 emitter/converter, and HTTP canonicalization, with corresponding regression tests and docs/changelog updates.

Changes:

• Extend @query options with style: "form" | "deepObject" and default deepObject to explode: true.
• Emit/roundtrip deepObject correctly in OpenAPI 3 (parameter attributes, conversion back to TypeSpec, and example serialization using bracket notation).
• Propagate query style through HTTP canonicalization and add regression tests across packages.

File summaries

File	Description
website/src/content/docs/docs/libraries/http/reference/data-types.md	Documents the new QueryOptions.style option and its behavior.
packages/openapi3/test/tsp-openapi3/parameters.test.ts	Adds OpenAPI→TypeSpec conversion coverage for deepObject and explode.
packages/openapi3/test/parameters.test.ts	Adds TypeSpec→OpenAPI emission coverage for deepObject and default/explicit explode.
packages/openapi3/test/examples.test.ts	Adds example serialization coverage for deepObject (bracket notation) and explode handling.
packages/openapi3/src/openapi.ts	Emits query parameter style/explode attributes for deepObject and encoded styles.
packages/openapi3/src/examples.ts	Serializes deepObject query examples as name[key]=value pairs.
packages/openapi3/src/cli/actions/convert/utils/decorators.ts	Preserves deepObject (and explode when needed) when converting OpenAPI 3 params to TypeSpec decorators.
packages/http/test/typekit/http-request.test.ts	Updates expectations to include default query style: "form".
packages/http/test/routes.test.ts	Updates URI template query parameter expectations and diagnostics coverage to include style.
packages/http/test/http-decorators.test.ts	Adds @query validation/behavior tests for style, including deepObject.
packages/http/src/parameters.ts	Sets URI-template-derived query parameter style to "form".
packages/http/src/http-property.ts	Expands “use-uri-template” diagnostic triggering to include query style usage.
packages/http/src/decorators.ts	Plumbs style through @query and applies defaults (deepObject ⇒ explode: true, default style "form").
packages/http/lib/decorators.tsp	Updates the public TypeSpec decorator options model to include style.
packages/http/generated-defs/TypeSpec.Http.ts	Updates generated TS types to include QueryOptions.style.
packages/http-canonicalization/src/operation.ts	Adds query style to canonical query parameter options and propagation.
packages/http-canonicalization/src/operation.test.ts	Adds regression test ensuring canonicalization preserves query style.
.chronus/changes/support-deep-object-query-style-2026-09-07.md	Adds a changelog entry for the feature across affected packages.

Review details

Suppressed comments (1)

.chronus/changes/support-deep-object-query-style-2026-09-07.md:10

• For changeKind: feature, the changelog guidelines require including a short illustrative code block showing how to use the new functionality (see .github/copilot-instructions.md:139).

Add `style: "deepObject"` support to `@query` options and preserve the style when emitting or converting OpenAPI 3.

• Files reviewed: 18/18 changed files
• Comments generated: 0
• Review effort level: Lite

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