v0.3.4

Fix: sm discover (the table-prune step of a real-DB onboarding) no longer crashes with ModuleNotFoundError on a pip/marketplace install — it resolves the prune-page renderer via the plugin root.

Also: docs refreshed (README slimmed, PyPI install surfaced, changelog backfilled) and internal cleanup (spec-ID references removed from the public repo; dead-code + test hygiene).