Add preview mock support for secrets RPCs

[Copilot]

The preview mock WaveEnv was missing the secrets RPC surface used by config/secrets flows. This adds mock implementations for the four secrets commands so preview and test environments can exercise secrets behavior without a backend.

• Added mock secrets RPC handlers

  • Implemented GetSecretsLinuxStorageBackendCommand
  • Implemented GetSecretsNamesCommand
  • Implemented GetSecretsCommand
  • Implemented SetSecretsCommand

• Backed secrets RPCs with in-memory state

  • Added a per-env in-memory secret store inside makeMockRpc
  • SetSecretsCommand now supports both upsert and delete (null => remove)
  • GetSecretsNamesCommand returns sorted secret names for stable behavior
  • GetSecretsCommand returns only requested keys that exist
  • GetSecretsLinuxStorageBackendCommand returns "libsecret" on Linux previews and "" elsewhere

• Kept the change scoped to preview/mock behavior

  • Wired platform into the mock RPC layer without changing production RPC behavior
  • Updated the mock environment contract comments to reflect the newly supported RPCs

• Added focused coverage

  • Extended frontend/preview/mock/mockwaveenv.test.ts to cover set/get/list/delete semantics and Linux backend reporting

const env = makeMockWaveEnv({ platform: "linux" });

await env.rpc.SetSecretsCommand(null as any, {
    OPENAI_API_KEY: "sk-test",
    ANTHROPIC_API_KEY: "anthropic-test",
} as any);

const names = await env.rpc.GetSecretsNamesCommand(null as any);
// ["ANTHROPIC_API_KEY", "OPENAI_API_KEY"]

const secret = await env.rpc.GetSecretsCommand(null as any, ["OPENAI_API_KEY"]);
// { OPENAI_API_KEY: "sk-test" }

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• frontend/preview/mock/mockwaveenv.ts - Adds mock implementations for secrets-related RPC commands (getsecrets, setsecrets, getsecretsnames, getsecretslinuxstoragebackend)
• frontend/preview/mock/mockwaveenv.test.ts - Adds test coverage for secrets commands with in-memory storage

The changes implement mock versions of the secrets-related RPC commands for the preview/test environment. The implementation:

• Correctly handles setting, getting, and deleting secrets via null values
• Returns "libsecret" for Linux platform and empty string otherwise
• Returns sorted secret names
• Includes proper null coalescing for input parameters
• Follows existing patterns in the mockwaveenv.ts file

No issues found.