This follow-up to #383 turns the implicit post-refresh state rules into
an explicit locator contract so transient refresh graphs do not silently
regress later resolve, find, or telemetry behavior.

- add `RefreshStatePersistence` and scope-aware
`sync_refresh_state_from()` to the core `Locator` contract
- classify config-only, self-hydrating, and synchronized locators across
Conda, Poetry, PyEnv, PipEnv, Uv, Linux global Python, Windows Registry,
and Windows Store
- make refresh-state handoff generic in `jsonrpc.rs`, including
partial-refresh handling and workspace-scope Poetry merges
- align config-carrying locators with replace semantics so cleared
configure inputs do not leave stale executables or workspace directories
behind
- add unit coverage for Conda partial-refresh behavior, Poetry workspace
merges and configure clearing, PyEnv self-hydration, and Windows
Registry/Store sync semantics

Fixes #387