Update C# client emitter TCGC dependency to 0.71.2

[Dapeng Zhang (ArcturusZhang)]

Summary

• update the C# client emitter TCGC dev dependency and peer lower bound to 0.71.2
• scope affected @convenientAPI test fixtures to C# for the new TCGC validation
• add a Chronus dependency entry

Validation

• npm install
• eng/scripts/Generate.ps1
• npm run build
• npm run test:emitter (239 passed, 2 skipped)
• npm run test:generator
• npm run cop
• changed files pass Prettier

npm run lint -- --emitter cannot complete because the current script forwards an unsupported --emitter option to ESLint; plain npm run lint also reports that this package has no ESLint configuration. Root pnpm format encounters existing TypeSpec parser errors outside this change; all unrelated formatter changes were restored.

[Copilot]

Pull request overview

Updates the C# client emitter to TCGC 0.71.2 and adapts affected test fixtures.

Changes:

• Updates TCGC dependency ranges and lockfile.
• Scopes @convenientAPI fixtures to C#.
• Adds a Chronus dependency entry.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/http-client-csharp/package.json	Updates TCGC dependency constraints.
packages/http-client-csharp/package-lock.json	Locks TCGC 0.71.2.
packages/http-client-csharp/emitter/test/Unit/usage.test.ts	Scopes convenience API fixtures to C#.
packages/http-client-csharp/emitter/test/Unit/operation-paging.test.ts	Scopes paging fixtures to C#.
.chronus/changes/deps-csharp-tcgc-0.71.2-2026-08-24.md	Records the dependency update.

Files not reviewed (1)

• packages/http-client-csharp/package-lock.json: Generated file

Suppressed comments (2)

packages/http-client-csharp/emitter/test/Unit/usage.test.ts:636

• @protocolAPI(false) is still unscoped at lines 617 and 623 in this same TCGC fixture. In 0.71.2, decorator-requires-scope applies to @protocolAPI as well as @convenientAPI, so this compile still emits validation diagnostics even though these adjacent convenience decorators are scoped. Please change both calls to @protocolAPI(false, "csharp").

    @convenientAPI(false, "csharp")

packages/http-client-csharp/package.json:75

• The C# generator fixtures are not covered by this scoping update: generator/TestProjects/Local/Sample-TypeSpec/Sample-TypeSpec.tsp and generator/TestProjects/Plugin/Sample-TypeSpec/Sample-TypeSpec.tsp still contain unscoped @convenientAPI(true/false) calls (and unscoped @protocolAPI(false)). TCGC 0.71.2 requires these decorators to carry the "csharp" scope, so the generator inputs still produce decorator-requires-scope diagnostics. Please update those fixtures before accepting the dependency bump.

    "@azure-tools/typespec-client-generator-core": "0.71.2",

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