docs: reframe as extensions + replace Signal & Noise artifact
Two changes, one commit: 1. Reframe "weaknesses" as "extensions memex adds": Karpathy's gist is a concept pitch, not an implementation. Reframe the seven places memex extends the pattern as engineering-layer additions rather than problems to fix. Cleaner narrative — memex builds on Karpathy's work instead of critiquing it. Touches README.md (Why each part exists + Credits) and DESIGN-RATIONALE.md (section titles, trade-off framing, biggest layer section, scope note at the end). 2. Replace docs/artifacts/signal-and-noise.html with the full upstream version: The earlier abbreviated copy dropped the MemPalace integration tab, the detailed mitigation steps with effort pips, the impact before/after cards, and the qmd vs ChromaDB comparison. This restores all of that. Also swaps self-references from "LLM Wiki" to "memex" while leaving external "LLM Wiki v2" community citations alone (those refer to a separate pattern and aren't ours to rename). The live hosted copy at eric-turner.com/memex/signal-and-noise.html has already been updated via scp — Hugo picks up static changes with --poll 1s so the public URL reflects this file immediately.
This commit is contained in: