The old contract described the replacement tree, not the code still running
in installations that update to it. Deleted managed_uv imports escaped it.
Inventory the full reachable update-channel history, discover old entrypoint
paths and helper extractions, then union those imports with the working tree.
Refuse shallow regeneration. Preserve old names when current callers vanish.
Keep same-named function alternatives and require module-scope bindings.
Restore the additional historical names as inert shims. Installer boundaries
stop for relaunch rather than enable fallback installs. Keep live DingTalk
dependency setup on PM rather than the retired lazy_deps import.
History enumeration covers 33,720 commits at 1021a03256 and 8,078 selected
file versions. The generated contract contains 496 required imports with no
missing names. Dynamic edges and their manual-review limits remain visible.
No claim is made that static analysis proves all runtime plugin imports or
every historical platform path. See tests/compat/README.md.
Verification: 622 targeted tests passed with file retries disabled, including
the frozen contract, historical shims, real PM launch tests, and DingTalk.
Ruff, focused type checks, import guard, and comment prose checks passed.
The full suite and native Windows execution were not run locally.
