fix(coding-agent): prevent model picker exits with compatibility plugins

[wolfiesch]

What

Restore top-level imports for ModelPickerComponent and ModelHubComponent, replacing their shared synchronous require() loader. Add an isolated subprocess regression that opens the picker with the real compatibility shim installed, renders a model, dismisses the picker with Escape, and verifies that keyboard focus returns to the editor.

Why

On source-linked installs with Bun 1.3.14, pressing Alt+P after compatibility plugins initialize can terminate the session. The deferred require() passes through the process-global legacy-pi resolver and fails with NameTooLong on a repeated file:file:… path. When this exception escapes the key handler, the terminal disconnect path ends the session without showing the underlying loader error.

Related to #12293. This patch addresses the model picker and model hub only; it does not claim to close the whole issue. The provider-auth work in #12271 remains separate.

This deliberately restores eager imports for the two model overlays instead of changing the process-global compatibility resolver. Other deferred components remain unchanged. Startup timing was not measured.

Testing

• New test/model-picker-compat.test.ts: failed before the fix with the reported NameTooLong error; passes after the fix. Compatibility plugin registration stays inside a child process so it cannot affect later tests.
• Passed from packages/coding-agent: bun test test/model-picker-compat.test.ts test/model-picker.test.ts test/model-hub.test.ts test/interactive-mode-model-cycle.test.ts.
• Passed from packages/coding-agent: bun run check (lint, formatting, and types). An existing unused-import warning remains in src/session/session-manager.ts.
• Exercised the source CLI in a PTY with an explicit extension installing installLegacyPiSpecifierShim(): Alt+P displayed the model picker, Escape dismissed it, and Alt+M displayed the model hub without exiting.
• Adding test/modes/controllers/selector-controller-login.test.ts to the focused test group exposes the existing auth loader failures. The same failures were reproduced on untouched upstream commit 10b867cb2e, without the new regression test or patch.
• Packaged binaries and other Bun versions were not exercised. No full workspace check or test suite was run.

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• bun check passes (package scope)
• Tested locally
• CHANGELOG updated with the required attribution

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