Prepare external agent migration for source adapters (#32884)

## What changed

- Add an optional `source` selector to `externalAgentConfig/detect`, while preserving the existing behavior for omitted, `null`, and unrecognized values.
- Pass `claude-code` as the source for TUI detection and import requests.
- Move source-specific migration behavior behind an adapter boundary and consolidate session migration into `codex-external-agent-migration`.

## Testing

- Cover explicit, omitted, and unknown detection source values with app-server protocol tests.
- Add unit coverage for the extracted migration and hook helpers.

GitOrigin-RevId: 63bd3dcb485f3ad7bd996022db4e351506aeea77
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charlesgong-openai authored and copyberry committed 2026-07-13 22:15:55 +00:00
1 parent 0877afbe85
commit bc8222b8d9
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+2713 -1850

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