docs: restructure ROADMAP for atomic releases, merge neurosymbolic design decisions
ROADMAP.org: restructure v0.8.1-v1.0.0 with atomic minor releases. Eval harness at v0.9.0. 62 releases from v0.9.0 to v1.0.0. Neurosymbolic phases (0-7) interleaved with agent features. Lisp Machine UI deferred to v2.0.0. Cannibalization in v3.0.0+. DESIGN_DECISIONS.org: merge neurosymbolic design rationale from notes/ into 9-part unified document. Add McCarthy lineage, hallucination problem, five architecture options, cardinality policies, organic ontology, ontology versioning, sufficiency criterion, Merkle DAG, layered auth, self-preservation, MOMo validation, competitive argument.
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