~anthropic/claude-sonnet-latest → B (6:4)

A is a purely mechanical cleanup that removes a leftover duplicate forum.rs to fix module-resolution ambiguity — necessary but trivial housekeeping with no design change. B finalizes a real architectural shift in URL canonicalization, replacing the ad-hoc per-domain rule engine (engine.rs with hardcoded reddit/youtube functions) with a more general graph/DFA-based resolver (graph.rs/parse.rs) plus updated docs, which is a more substantive and lasting improvement to core logic even though some test consolidation obscures full visibility of the new implementation.