- Key _user_space_cache on _conn_snapshot instead of client object identity,
so _new_client() results from the same connection share the cached user
(previously every on_memory_write triggered an uncached /api/v1/system/status
probe with a 30s default timeout)
- Thread a short timeout (0.05s) through the write-path identity probe
- Harden _tool_remember to snapshot the client before URI construction + POST,
matching the pattern already established in on_memory_write
- Remove dead instance method _user_scoped_uri (zero callers; all call sites
use the module-level function directly)
Co-authored-by: ehz0ah <haozhe4547@gmail.com>
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