docs: Phase A repo structure — archive, product, kebab-case
- Move copilot history and CSV to docs/archive/ - Add docs/product/ (SSP, intermediate, genre packs) and engineering/adrs/ - Rename all spaced/special-char doc paths to kebab-case - Nest competitive GTM under docs/gtm/competitive/ - Point README and NORTH_STAR at CANONICAL_STRATEGY - Leave code/ unchanged for later monorepo Phase B
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