New top-level Philosophy section in sx-docs. Moved SX Manifesto and Strange Loops from Essays, added three new essays: SX and Wittgenstein (language games, limits of language, fly-bottles), SX and Dennett (real patterns, multiple drafts, intentional stance), and S-Existentialism (existence precedes essence, bad faith, the absurd). Updated all cross-references and navigation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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