fix(management): preserve callback forwarder reuse and cleanup generated artifacts

[xiaojiou176]

Repo closure salvage PR created during root workspace closure.\n\nIncluded commits:\n- chore(cleanup): stop tracking generated coverage and mock upstream artifacts\n- fix(management): reuse shared codex callback forwarder\n\nPurpose:\n- preserve effective local staged code safely under branch protection\n- move child repo closer to single-main clean baseline

[greptile-apps]

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[Copilot]

Pull request overview

This PR cleans up generated artifacts from version control and updates the management OAuth callback forwarder to support safe reuse across concurrent WebUI auth sessions (instead of tearing down the listener per request).

Changes:

• Add reference-counted reuse for the callback forwarder keyed by port/provider/target.
• Add a management handler test covering shared forwarder lifecycle behavior.
• Remove tracked coverage output artifacts from the repository.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
internal/api/handlers/management/auth_files.go	Add forwarder reuse + ref-counted lifecycle management for callback listener.
internal/api/handlers/management/auth_files_codex_webui_test.go	Add test asserting forwarder reuse and that the listener remains until the last release.
coverage.audit.out	Remove generated coverage artifact from tracking.
coverage-core-auth-proxy.out	Remove generated coverage artifact from tracking.
coverage-amp-target.out	Remove generated coverage artifact from tracking.

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[terryyifeng]

Reviewed with write access after forwarder lifecycle, cleanup, and race fixes. Approving pending green checks.

[terryyifeng]

Reviewed with fresh local verification: management package tests and race checks pass, doc gate is green, and the callback forwarder lifecycle issues have been addressed.