Two review items raised on #65449 (thanks @hansai-art):
1. Explicit test that post-module-load registration REBUILDS the
_PREFIX_SUBSTRINGS pre-screen tuple — plugin patterns flow through
the same fast path as built-ins, never around it. This was covered
implicitly by the masking tests; now it is asserted directly.
2. Plugin patterns are now stored keyed by registration source, giving
the #64229 lifecycle/ownership-ledger work a clean seam to drop one
plugin's patterns on unload. No public removal API is added —
additive-only stands; unload remains a host-owned lifecycle concern.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PnMCvi2vXqfs996AjVeF2F
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