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

docs/product/README.md

@@ -0,0 +1,13 @@
+# Product
+
+Product definitions for what we build and sell. Aligns with [Canonical Strategy](../strategy/CANONICAL_STRATEGY.md).
+
+| Doc | Purpose |
+|-----|---------|
+| [overview.md](./overview.md) | Product map across the four models |
+| [ssp.md](./ssp.md) | Self-Service Portal (primary SMB experience) |
+| [intermediate.md](./intermediate.md) | Tourism boards, chambers, visitor bureaus |
+| [genre-packs.md](./genre-packs.md) | Vertical primitives strategy |
+| [use-cases/](./use-cases/) | Canonical use cases (to be filled) |
+
+These folders start thin on purpose. Expand them as decisions lock; do not reintroduce conflicting product stories in GTM-only docs.