chore(app-server): delete v1 RPC methods and notifications

[owenlin0]

Summary

This removes the old app-server v1 methods and notifications we no longer need, while keeping the small set the main codex app client still depends on for now.

The remaining legacy surface is:

• initialize
• getConversationSummary
• getAuthStatus
• gitDiffToRemote
• fuzzyFileSearch
• fuzzyFileSearch/sessionStart
• fuzzyFileSearch/sessionUpdate
• fuzzyFileSearch/sessionStop

And the raw codex/event/* notifications emitted from core. These notifications will be removed in a followup PR.

What changed

• removed deprecated v1 request variants from the protocol and app-server dispatcher
• removed deprecated typed notifications: authStatusChange, loginChatGptComplete, and sessionConfigured
• updated the app-server test client to use v2 flows instead of deleted v1 flows
• deleted legacy-only app-server test suites and added focused coverage for getConversationSummary
• regenerated app-server schema fixtures and updated the MCP interface docs to match the remaining compatibility surface

Testing

• just write-app-server-schema
• cargo test -p codex-app-server-protocol
• cargo test -p codex-app-server

[owenlin0]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

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