docs: frame Lean 4 mode (Arc 8)
The approved framing for Arc 8, revision 4, after three review rounds. Seven stages: grammar/mode, multi-root LSP affinity, the Lean language server, the Unicode input method, the goal view, the #eval output channel, and module hierarchy. 19 decisions, 64 acceptance criteria. Committed as this branch first commit per the house workflow; the implementation of Stage 1 follows. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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