refactor: split SDK RPC client

[kermanx]

Related Issue

No linked issue. This change comes from maintainer discussion to make the SDK harness usable with a transport supplied by web integrations.

Problem

The SDK harness constructed its local in-memory RPC client internally, which made it hard for other runtimes to provide their own RPC transport without reworking the harness itself. CLI startup also needed to keep using the local runtime path after the constructor split.

What changed

• Split the shared SDK RPC behavior from the local in-memory RPC client implementation.
• Updated the harness to accept an injected RPC client plus explicit runtime dependencies.
• Added a local harness factory and updated the CLI, tests, and SDK examples to use it.
• Added a changeset for the SDK and CLI bundle.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

Verification

• pnpm exec oxlint apps/kimi-code/src/cli/run-shell.ts apps/kimi-code/src/cli/run-prompt.ts apps/kimi-code/src/cli/sub/export.ts apps/kimi-code/test/cli/run-shell.test.ts apps/kimi-code/test/cli/run-prompt.test.ts apps/kimi-code/test/cli/export.test.ts apps/kimi-code/test/e2e/real-llm-smoke.e2e.test.ts apps/kimi-code/test/e2e/local-logging-export.e2e.test.ts packages/node-sdk/examples/kimi-harness-auth-smoke.ts packages/node-sdk/examples/t8-race-create.ts packages/node-sdk/src/kimi-harness.ts packages/node-sdk/src/local-rpc.ts
• pnpm -C packages/node-sdk run typecheck
• pnpm -C apps/kimi-code run typecheck
• pnpm -C apps/kimi-code exec vitest run test/cli/run-shell.test.ts test/cli/run-prompt.test.ts test/cli/export.test.ts
• pnpm dev:cli -- migrate

[changeset-bot]

🦋 Changeset detected

Latest commit: c559277

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@moonshot-ai/kimi-code-sdk	Minor
@moonshot-ai/kimi-code	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[chatgpt-codex-connector]

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[pkg-pr-new]

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commit: c559277

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 4c39d31e99

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[chatgpt-codex-connector]

Preserve the identity user-agent suffix

When a host passes identity.userAgentSuffix, the local RPC client now rebuilds the headers with only userAgentProduct and version, so createKimiDefaultHeaders no longer receives the suffix and the generated User-Agent silently loses the host-provided qualifier. This regresses SDK callers that use the public KimiHostIdentity.userAgentSuffix to distinguish integrations; pass the full identity through as before instead of selecting only these two fields.

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