fix(claude-desktop): explain pre-apply gateway state

[luvs01]

Motivation

• The CLI could misattribute a gateway preference to a machine when that gateway marker had just been written by the current apply invocation, producing misleading advice to run ocx claude desktop apply --first-party on a fresh fallback.

Description

• Capture a pre-apply configuration snapshot with const preApplyConfig = loadConfig() and use it for parsing and mode explanation so post-apply writes do not alter the reasoning presented to the user.
• Pass preApplyConfig into parseDesktopApplyArgs and into gatewayModeExplanation instead of reloading the config after the apply.
• Add a CLI-level regression assertion in tests/claude-integration/claude-desktop-cli.test.ts that disables the intercept and verifies the implicit gateway fallback does not recommend --first-party.

Testing

• Ran bun run typecheck which completed successfully without type errors.
• Ran repository checks (git diff --check) and ensured the working tree is clean after the change.
• Attempted focused tests with bun test tests/claude-integration/claude-desktop-mode-explanation.test.ts tests/claude-integration/claude-desktop-cli.test.ts, but the test run could not load due to the container's Bun 1.2.14 missing the node:zlib zstdDecompressSync export, so the tests did not execute in this environment.

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[chatgpt-codex-connector]

Codex Review Summary

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

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-21T02:37:59.037120Z	7597bce	PR opened

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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✅ Deterministic PR hygiene checks passed.

[luvs01]

Consolidated into lidge-jun#5590 as a single related-function aggregate.

Source head: 7597bcea4a8f63fd6be072a8108567d2d22550ff. Replacement head: 2f61b77dd54e07d67637224a3fc4ccf250ab4739.

The complete two-file CLI explanation contribution is carried as 02414cc with matching zero-context stable patch ID 8ec0e3a9b57442c88dfac2db283b167297a33038. The pre-apply state is captured once and the no-argument explanation regression remains in the integrated CLI suite. Subsequent fixture changes preserve both no-argument and --static assertions as separate cases. Five mode-explanation tests passed; the earlier CLI 40-pass sample and preceding same-content 38-pass/2-timeout sample are both disclosed on the draft replacement. No live runtime or account settings were changed.

Closing this duplicate standalone review entry as part of the requested consolidation after verifying coverage. This is not a merge or release claim; remaining integration checks and reviews are tracked on the replacement. Original branches are retained.