[WRONG BRANCH] fix(cli): preserve absent OAuth plan fields

[luvs01]

Motivation

• Restore the documented compatibility contract where an absent plan key means the proxy predates tier reporting while plan: null means the proxy checked and found no tier.
• Prevent the current CLI from synthesizing plan: null for accounts that simply omitted the field, which breaks downstream version-detection and automation.

Description

• Forward the server-provided plan property verbatim by including plan only when the response object actually owns the property using Object.hasOwn(a, "plan") in src/cli/account-api.ts.
• Add a focused regression test tests/cli/cli-account.test.ts that verifies three cases: absent plan (older proxy), explicit null, and a known string value.

Testing

• Ran the focused CLI test: node_modules/bun/bin/bun.exe test tests/cli/cli-account.test.ts --test-name-pattern 'OAuth JSON preserves the plan presence signal' and it passed with the repository Bun (1.4.2).
• Ran the full CLI account test file: node_modules/bun/bin/bun.exe test tests/cli/cli-account.test.ts and the tests in that file passed (no failures reported).
• Typecheck and privacy checks were run via bun x tsc --noEmit and bun run privacy:scan and both succeeded; note that the system Bun 1.2.14 lacks node:zlib.zstdDecompressSync, so the repository-pinned Bun 1.4.2 was used for the successful runs.

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-12T01:33:53.285504Z	2e6d63d	PR opened

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✅ Deterministic PR hygiene checks passed.

[github-actions]

⏳ DRAFT

• wrong target branch (main); retarget to dev.

What to do

• Retarget this PR to dev — all contributions go to dev.

Its title has been prefixed with [WRONG BRANCH].
This pull request is being kept as a draft automatically. Once every issue above is resolved, it will be marked ready for review again.