* refactor(anthropic): split session-catalog into concept modules
Follow the #124178 sibling seam pattern while preserving behavior. Remove the max-lines suppression and baseline entry after the split.
* refactor(anthropic): own record caches in session-catalog-discovery
The record-shaped caches (catalogDiscoveryCache, claudeSessionScanCache,
their entry types, bounds, and TTLs) are consumed only by discovery; moving
them out of scan removes the scan->discovery type-import edge flagged by the
madge topology gate and leaves scan as record-agnostic fs primitives.
Peter Steinberger