fix: namespace app-server client info

[d3v07]

Closes #199

Summary

• rename the default app-server clientInfo.name from Claude Code to codex_claude_code
• capture the app-server initialize payload in the fake Codex fixture
• add a regression test that verifies the plugin initializes Codex with the codex-namespaced client name

Verification

• npm test
• npm run build

[Copilot]

Pull request overview

This PR fixes the Codex app-server clientInfo.name default so the Claude Code plugin identifies itself with a Codex-namespaced client identifier, and adds a regression test to prevent reintroducing the old host-app name.

Changes:

• Rename the default clientInfo.name from "Claude Code" to "codex_claude_code" in the app-server client.
• Extend the fake Codex fixture to persist the initialize request payload for inspection.
• Add a runtime regression test asserting the app-server is initialized with the namespaced client name.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
plugins/codex/scripts/lib/app-server.mjs	Updates the default clientInfo.name used in app-server initialize requests.
tests/fake-codex-fixture.mjs	Captures and stores the last initialize payload in fixture state for assertions.
tests/runtime.test.mjs	Adds a regression test verifying the initialize payload contains the namespaced client name.

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